Tobacco Use Disorder

40

Review clinical trials related to Tobacco Use Disorder. Use filters to narrow results by trial status, phase, treatment, biological sex and sponsor.

Condition / disease
Location
Status: Not yet recruiting

Deep Transcranial Magnetic Stimulation for Tobacco Cessation in Adults With Opioid Use Disorder

This pilot study will evaluate the use of deep transcranial magnetic stimulation (Deep TMS) to help adults with opioid use disorder (OUD) who are receiving medications for opioid use disorder (MOUD) such as buprenorphine or methadone and who continue to smoke cigarettes and want to quit. Deep TMS is a noninvasive form of brain stimulation that uses magnetic pulses. The BrainsWay Deep TMS System is FDA-cleared for smoking cessation. This study will use the H4 coil smoking-cessation protocol in people with OUD receiving MOUD. Approximately 12 participants will take part and all participants will receive active Deep TMS. There is no sham or placebo group and no random assignment. Participants may receive up to 18 Deep TMS sessions over 6 weeks: five sessions per week during the first 3 weeks, followed by one session per week during Weeks 4 through 6. Participants will return for a follow-up visit at Week 10. The main purpose of the study is to learn whether this Deep TMS approach is safe, tolerable and feasible for people with OUD receiving MOUD and to estimate how many participants are able to remain smoke-free from Week 6 through Week 10. The study will also look for early changes in tobacco craving, opioid craving, continuation of MOUD, mood and anxiety symptoms, pain, heart rate variability, and participants' experiences with the treatment. The findings will be used to help plan a larger future study.

Participants needed: 12
Trial details
Age: 22-70Biological sex: AllType: InterventionalSponsor: Payel RoyUpdated: Aug 18, 2026Locations: 2
Eligibility criteria

Male or female participants, 22-70 years old. [+9]

History of seizure disorder, epilepsy, stroke, significant head trauma, or other... [+14]

Status: Recruiting

Contingency Management for Veteran Smokers Undergoing Major Elective Surgery

The goal of this study is to design and test the first mobile contingency management (CM) smoking cessation intervention for military Veterans undergoing major elective surgery. Smoking is the leading risk factor for postoperative complications and is associated with longer hospital stays, reoperations, and 30-day mortality. Smoking rates among patients undergoing major elective surgery are high, 22.3-43.0%. It is imperative to identify efficacious, strategically timed smoking cessation interventions for surgery patients. CM incentivizes smoking cessation through positive reinforcement (rewards) when bioverified abstinence is achieved. To ensure feasibility, CM must be tailored to the clinical context. CM for smoking cessation has never been delivered before and after major surgery, nor has mobile CM bioverification been trialed perioperatively. The investigators will develop and test a tailored mobile smoking cessation CM protocol for Veterans undergoing major elective surgery.

Participants needed: 36
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: University of California, San FranciscoUpdated: Aug 11, 2026Locations: 1
Eligibility criteria

English-speaking; [+4]

Untreated, current, active problem gambling, assessed by medical record diagnosi... [+6]

Status: Not yet recruiting

THCV Treatment for Smokers

This study will randomize 32 non-treatment-seeking individuals who smoke cigarettes daily into a randomized, crossover, double-blind, placebo-controlled study testing the safety, tolerability, and initial efficacy of Δ9-tetrahydrocannabivarin (Δ9-THCV).

Participants needed: 32
Trial details
Phase: Phase 2Age: 21-65Biological sex: AllType: InterventionalSponsor: University of California, Los AngelesUpdated: Aug 4, 2026
Eligibility criteria

Be between the ages of 21 and 65; [+7]

Have current (last 12 months) DSM-5 diagnosis of substance use disorder for any... [+14]

Status: Not yet recruiting

Varenicline for Smoking Reduction in Veterans Not Ready To Quit

In order to reduce the prevalence of cigarette smoking among Veterans, it is vital that healthcare providers offer effective tobacco treatment to all Veterans who smoke, including those not ready to make a quit attempt. Smoking treatments currently available to Veterans who are not ready to quit are only weakly effective. This project will generate new knowledge about the effectiveness of a promising varenicline-based intervention designed to increase quit attempts and long-term abstinence in Veterans who are initially not ready to quit. This project has great potential to engage Veterans not ready to quit smoking in treatment that increases quit attempts and quitting success, thereby reducing morbidity and mortality caused by smoking in Veterans.

Participants needed: 400
Trial details
Phase: Phase 4Age: 21+Biological sex: AllType: InterventionalSponsor: VA Office of Research and DevelopmentUpdated: Jul 31, 2026Locations: 4
Eligibility criteria

Report smoking an average of 5 or more cigarettes daily for the previous 6 month... [+6]

Unable to give informed, voluntary consent to participate [+3]

Status: Recruiting

Project Q: Cue-based Treatment Intervention to Promote Cessation Among People Who Smoke Lightly or Non-daily

This study aims to test the feasibility and acceptability of a remotely delivered cue-based treatment intervention to promote smoking cessation among people who smoke lightly or non-daily. Secondary objectives include assessing preliminary efficacy on cessation and examining cue reactivity. Participants will be randomized to CBT only or CBT + cue-based treatment, with assessments at baseline, end-of-treatment, 6 months, and 12 months.

Participants needed: 60
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: Duke UniversityUpdated: Jul 28, 2026Locations: 1
Eligibility criteria

Age ≥18 [+4]

Current participation in another smoking cessation study [+3]

Status: Not yet recruiting

Evaluation of the Efficacy of QUITOXIL® in Smoking Cessation

As part of post-marketing clinical monitoring and with a view to applying for the digital medical device Quitoxil® to be included on the LPPR list, this prospective, multicentre, controlled, randomised clinical trial aims to evaluate the clinical impact of support provided by Quitoxil® as an adjunct to conventional management for patients undergoing smoking cessation who have a tobacco use disorder.

Participants needed: 606
Trial details
Age: 18-65Biological sex: AllType: InterventionalSponsor: KLAVA InnovationUpdated: Jul 24, 2026
Eligibility criteria

Men or women aged between 18 and 65 [+10]

Individuals who, at the time of inclusion ( ), have been receiving another form... [+6]

Status: Not yet recruiting

Impact of Novel vs. Usual Brand Menthol Cigarettes on Abuse Liability

This randomized, double-blind, crossover human laboratory study compares the abuse liability of cigarettes containing menthol and non-menthol cigarette variants, using the participant's usual brand menthol cigarette as a within-subject reference. Participants complete standardized laboratory smoking sessions, behavioral economic tasks, and a naturalistic observational period. The study examines differences in nicotine delivery, smoking behavior, and subjective effects across cigarette types in laboratory and real-world contexts.

Participants needed: 48
Trial details
Age: 21+Biological sex: AllType: InterventionalSponsor: Ohio State University Comprehensive Cancer CenterUpdated: Jul 22, 2026Locations: 1
Eligibility criteria

Aged 21 years or older [+6]

Current diagnosis of any significant lung diseases (e.g., asthma, chronic obstru... [+5]

Status: Not yet recruiting

Abstinence Reinforcement Therapy for Veterans Who Smoke Tobacco and Are Experiencing Homelessness

Seventy to eighty percent of Veterans experiencing homelessness (VEH) smoke, which is four times the rate of the U.S. population and 2.5 times higher than among impoverished Americans. Smoking- related deaths among persons experiencing homelessness occur at double the rate seen among more stably housed people. The purpose of this study study is to evaluate the effectiveness of an intervention to help Veterans experiencing homelessness stop smoking. The intervention, called Abstinence Reinforcement Therapy + (ART+), includes telehealth-based counseling, smoking cessation aids, and mobile contingency management (mCM). mCM is an intervention in which participants are paid for smoking abstinence. 120 Veterans who smoke cigarettes and are experiencing homelessness will be randomly assigned to receive either ART+ or usual smoking cessation care. The primary outcome to be evaluated is the rate at which Veterans assigned to the ART+ condition report smoking abstinence and have their abstinence verified using salivary testing.

Participants needed: 120
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: VA Office of Research and DevelopmentUpdated: Jul 20, 2026Locations: 1
Eligibility criteria

Are homeless [+2]

Have uncontrolled psychotic symptoms [+2]

Status: Not yet recruiting

Feasibility of a Medical-Legal Partnership Model to Connect Coal Miners QuitAid

Coal miners in Central Appalachia have among the highest rates of tobacco and nicotine product (TNP) use of any occupational group and face elevated rates of lung cancer and coal workers' pneumoconiosis ("black lung"). This study tests a novel medical-legal partnership (MLP) that "flips" the traditional referral direction: lawyers representing coal miners in black-lung workers' compensation cases identify clients who use TNPs and, through an ask-advise-connect process, connect them to community pharmacists who deliver QuitAid, a pharmacist-delivered medication therapy management (MTM) program, together with nicotine replacement therapy (NRT). The study has two aims: (1) an implementation-science evaluation of the ask-advise-connect process in black-lung law offices, and (2) a randomized feasibility pilot in which coal miners who use TNPs are randomized to receive QuitAid or not, with all participants receiving 24 weeks of NRT. As a feasibility pilot, the study is designed to estimate recruitment, randomization, retention, fidelity, and dose parameters to inform a future NCI R01, and is not powered to detect differences between conditions.

Participants needed: 120
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: University of VirginiaUpdated: Jul 10, 2026Locations: 1
Eligibility criteria

Age ≥ 18 years [+5]

Medical contraindication to NRT (e.g., within the past 30 days: heart attack or... [+1]

Status: Recruiting

Young Adult Tobacco/Nicotine and Cannabis Co-use

The goal of this project is to better understand the relationship between tobacco/nicotine and cannabis using behavioral economics during a tobacco/nicotine quit attempt. All participants will receive tobacco/nicotine cessation treatment (smoking and/or vaping treatment) for 12 weeks. To qualify, participants must be between the ages of 18-25 and use tobacco products (smoke cigarettes and/or vape nicotine) and use cannabis (in any form). Participants do not need to be interested in quitting cannabis/marijuana to qualify. This study is being conducted by the Medical University of South Carolina. All procedures are conducted remotely and there is no in-person visits are needed.

Participants needed: 350
Trial details
Age: 18-25Biological sex: AllType: InterventionalSponsor: Medical University of South CarolinaUpdated: Jul 6, 2026Locations: 1
Eligibility criteria

Between the ages of 18 and 25 years old [+6]

Any significant or acutely unstable medical, psychiatric, or substance use probl... [+3]

Status: Recruiting

5-HT2A Agonist Psilocybin in the Treatment of Tobacco Use Disorder

This is a multi-site, double-blind, randomized clinical trial of the 5-HT2A receptor agonist psilocybin for smoking cessation. Four sites with experience in conducting psilocybin research will be involved in this trial: Johns Hopkins University (JHU), the University of Alabama at Birmingham (UAB), and New York University (NYU). The proposed study will treat 66 participants (22 at each site), randomized to receive either: 1) oral psilocybin (30 mg in session 1 and either 30 mg or 40 mg in session 2); or 2) oral niacin (150 mg in session 1 and either 150 mg or 200 mg in session 2), with sessions 1 week apart.

Participants needed: 66
Trial details
Phase: Phase 2Age: 21+Biological sex: AllType: InterventionalSponsor: Johns Hopkins UniversityUpdated: Jun 29, 2026Locations: 3
Eligibility criteria

21 years old or older [+5]

The use of e-cigarettes or tobacco products other than machine-manufactured comb... [+14]

Status: Not yet recruiting

LaunchPad: Supporting Healthy Decisions and Preventing Drug Use After High School

LaunchPad is an online substance use prevention program for high school seniors. The program is designed to help seniors develop skills and make informed decisions as they transition from high school to young adulthood. The purpose of this clinical trial is to learn whether individual LaunchPad lessons improve the specific attitudes, intentions, and skills they are designed to address. For example, researchers will examine whether the stress management lesson increases students' intentions to use healthy ways of managing stress. The main question this study aims to answer is: Does each individual LaunchPad lesson improve the specific outcomes it was designed to address? Researchers will compare students who receive a particular lesson with students who do not receive that lesson to determine whether the lesson changes the intended outcome. Participants will: * Complete a brief baseline survey * Complete two introductory online lessons * Complete one or more randomly assigned LaunchPad lessons * Complete a brief follow-up survey All surveys and lessons will be completed online.

Participants needed: 5,000
Trial details
Age: 15-21Biological sex: AllType: InterventionalSponsor: Prevention Strategies, LLCUpdated: Jun 25, 2026
Eligibility criteria

Public or private school in the U.S. enrolling 12th grade students [+4]

Status: Recruiting

E-cigarette Cessation in Adults Who Co-use Cannabis

The purpose of this study is to better understand tobacco outcomes using a commonly prescribed stop smoking medication (varenicline) and financial incentives for adults who also use cannabis. Varenicline is not FDA approved for e-cigarette cessation, but is FDA approved for cigarette cessation. Investigators are also interested in how cannabis/marijuana and tobacco interact during a tobacco quit attempt. All participants will receive e-cigarette cessation treatment for 12 weeks. To qualify, participants must be between the ages of 18-40 and use both e-cigarettes and cannabis. Participants do not need to be interested in quitting cannabis to qualify. This study is being conducted at three sites: the Medical University of South Carolina in Charleston, SC, Behavioral Health Services in Pickens, SC, and MUSC Lancaster in Lancaster, SC.

Participants needed: 105
Trial details
Phase: Phase 4Age: 18-40Biological sex: AllType: InterventionalSponsor: Medical University of South CarolinaUpdated: Jun 12, 2026Locations: 3
Eligibility criteria

Between the ages of 18 and 40 years old [+5]

Any serious or unstable medical/psychiatric disorder (including severe substance... [+4]

Status: Not yet recruiting

Chatbot for Online Support Groups to Treat Tobacco Addiction

Investigators will conduct a pilot RCT to test the efficacy of an intelligent chatbot to aid small, private, quit-smoking peer support groups. Participants will be randomized to an intervention arm (chatbot-enhanced support group), or a control arm (support group only). In the intervention arm (N=60), each support group will be connected to an intelligent chatbot running on a secure local server as a trained LLM (large language model). The intelligent chatbot will function as an additional member of the GroupMe support group, but a member that only responds if no human does so. In the control arm (N=60), the support groups will be connected to an automated message-posting bot running on a secure local server. This automated message-posting bot will lack the response capabilities of the intelligent chatbot. But both the intelligent chatbot and the automated message-posting bot will post a pre-written daily discussion topic to encourage participants to discuss issues known to facilitate tobacco cessation or group bonding.

Participants needed: 120
Trial details
Age: 18-75Biological sex: AllType: InterventionalSponsor: University of California, IrvineUpdated: May 22, 2026
Eligibility criteria

Cigarette smokers (can also use e-cigarettes) [+10]

No NRT health contraindications [+3]

Status: Recruiting

Multilevel Intervention for LDCT Lung Cancer Screening and Smoking Cessation Among African Americans

This study aims to reduce disparities and the burden of lung cancer among African American smokers by supporting a Multiple-level intervention integrating lung cancer screening and smoking cessation (MILS), followed the NIH DEIA strategies using multilevel interventions that impact determinants of health and address health disparities at appropriate time points across the life course.

Participants needed: 250
Trial details
Age: 50-80Biological sex: AllType: InterventionalSponsor: Louisiana State University Health Sciences Center in New OrleansUpdated: May 11, 2026Locations: 2
Eligibility criteria

African American [+4]

N/A

Status: Recruiting

TUBSIS 2.0 - Tobacco Use Behavioral Support and Intervention System

Background: Tobacco smoking and vaping remains public health concern, with many adults continuing to experience difficulties accessing appropriate support for smoking cessation in Switzerland and Türkiye. Structural barriers, including stigma related to attempting to quit, limited financial and time resources, low awareness of the health risks associated with tobacco smoking- and vaping-reduce engagement with traditional services. TUBSIS 2.0 aims to address these access inequities by providing a fully remote, anonymous and free internet-based program tailored to diverse adult populations in both countries. Objectives: The "TUBSIS 2.0: An Adaptation Study of Tobacco Addiction Support Programme - TUBSIS for Tobacco Users in Switzerland and Türkiye" project aims to support readiness to reduce or quit tobacco smoking/vaping, improve well-being and self-compassion and strengthen health-related behaviors. The intervention targets German-, English-, and Turkish-speaking adults and includes mindfulness-based strategies for quitting or reducing tobacco smoking and vaping. Motivation to cease tobacco smoking/vaping varies considerably across the lifespan. Younger individuals may perceive smoking/vaping cessation as unnecessary, often due to limited awareness of long-term health risks or a sense of invulnerability. In later adulthood, although addiction tends to be more deeply established, many individuals hesitate to attempt cessation because of concerns about the psychological and behavioral challenges associated with the process. It is therefore essential to provide individuals with support that helps them understand the cessation process, prepare for the challenges that can be expected and identify strategies that align with their psychological needs. Such strategies may include stress management and self-compassion practices that can be utilized before, during and after cessation attempts. TUBSIS 2.0 offers structured and accessible guidance to support this preparation by providing a clear, evidence-based pathway for individuals at different stages of readiness to change. Methods: TUBSIS 2.0 is a web-based, individual and asynchronous program consisting of eight modules delivered over four weeks. A total of 406 participants will be recruited and randomly assigned to either the intervention or control group. Data are collected anonymously at four measurement points (baseline, mid-term, post-term and 8-week follow-up) from participants. The program focuses on supporting participants' reducing or quitting tobacco smoking or vaping; to increase their readiness for smoking/vaping cessation, mental well-being, self-compassion and stress management with mindfulness strategies. Within the Health Action Process Approach (HAPA), the process of behaviour change is conceptualised as a dynamic, non-linear process that progresses through motivational and volitional phases. TUBSIS 2.0 has been adapted to reflect this structure by integrating phase-specific components. These components include modules that enhance risk awareness and outcome expectancies, planning and self-regulation tools to support action initiation and mindfulness-based strategies that are embedded throughout all phases to strengthen self-efficacy and coping. By addressing these shifting needs across the change process, the programme provides a responsive and theory-driven pathway for reducing/quitting tobacco smoking or vaping. Relevance: TUBSIS 2.0 is highly relevant to public health priorities, as it provides a cost-effective, scalable and environmentally sustainable intervention that eliminates barriers commonly associated with traditional cessation services. By requiring no travel, printed materials or in-person appointments, the programme offers equitable access to adults across all age groups, genders and diverse migrant communities in Switzerland and Türkiye. Its multilingual and culturally adapted structure addresses significant service gaps for populations that are underserved or hesitant to seek conventional support. By reducing tobacco smoking- or vaping-related harm and facilitating early behavioural change, TUBSIS 2.0 has the potential to decrease long-term healthcare costs while expanding access to evidence-based digital prevention tools.

Participants needed: 406
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: University of ZurichUpdated: May 5, 2026Locations: 1
Eligibility criteria

Age: 18 years or older [+5]

Individuals who do not meet the inclusion criteria are excluded.

Status: Recruiting

Beta-Adrenergic Modulation of Drug Cue Reactivity

This study is designed to investigate the effects of a beta-adrenergic antagonist (Propranolol; 40 mg IR) and nicotine patch (14 mg) administered alone and in combination on neurobiological and behavioral responses to smoking cues in ongoing cigarette smokers. This is a basic experimental study in humans and participants will not take these medications for an extended period or make a cessation attempt as part of their involvement in this research project.

Participants needed: 80
Trial details
Phase: Phase 4Age: 21-60Biological sex: AllType: InterventionalSponsor: University of OklahomaUpdated: Apr 28, 2026Locations: 1
Eligibility criteria

Generally healthy [+7]

Inability to attend all required sessions [+13]

Status: Not yet recruiting

Emotional Brain Training for Addiction Medicine Treatment - A Pilot Study

The goal of this clinical trial is to determine whether Emotional Brain Training (EBT), a behavioral modification method, can help manage stress and health problems related to addiction. EBT teaches skills to deactivate harmful circuits (automatic reactions) and activate healing circuits to quickly shift mood from negative to positive. Participants in the EBT group will receive focused, intensive instruction on using these skills to rewire unwanted brain circuits, with the aim of achieving lasting improvements in emotional health and quality of life. The study will assess whether EBT is an effective tool when added to standard of care (SOC), which includes medications for addiction treatment (MAT). Researchers will compare changes in stress, anxiety, and cravings after 8 weeks of EBT plus SOC versus SOC alone. Participants: * will either continue receiving standard treatments (SOC) at the Addiction Recovery Clinic (ARC) at SAC Health in San Bernardino * or receive both EBT and SOC at ARC * in the SOC group will continue monthly visits at ARC and weekly counseling * in the EBT plus SOC group will continue monthly visits and weekly counseling at ARC, along with weekly EBT group sessions by telephone * will complete online assessments at weeks 0, 4, and 8 Upon completion of the study, all participants will resume SOC

Participants needed: 54
Trial details
Age: 18+Biological sex: AllType: InterventionalSponsor: Loma Linda UniversityUpdated: Apr 23, 2026Locations: 1
Eligibility criteria

Age 18 years old or older [+12]

Age <18 years old [+8]

Status: Recruiting

Accelerated dTMS Smoking Cessation

The goal of this clinical trial is to examine whether a 5-day course of bilateral accelerated deep transcranial magnetic stimulation (aTMS) is a feasible treatment to help adults (18-65) with Tobacco Use Disorder to quit smoking. This study aims to enroll 30-40 participants and will examine treatment tolerability, treatment acceptability, participant retention, and adherence to scheduled treatment sessions. There are two key objectives and hypotheses: Objective 1: To evaluate whether a 1-week course of bilateral aTMS (4 sessions per day for 5 days) is feasible and tolerable as a smoking cessation treatment. Hypothesis 1: Feasibility will be demonstrated by acceptable tolerability, acceptability, retention, and adherence, with a practical target of 30 out of 40 participants completing the treatment. Objective 2: To explore how aTMS affects smoking outcomes, including: * Point-prevalence abstinence at end of treatment and at Weeks 3, 5, and 9. * Prolonged/continuous abstinence at Weeks 13 and 26. * Craving, cigarettes per day, and dependence severity. Hypothesis 2: Participants will show improvements on these outcomes from post-treatment through follow-up.

Participants needed: 40
Trial details
Phase: Phase 2Age: 18+Biological sex: AllType: InterventionalSponsor: Waypoint Centre for Mental Health CareUpdated: Apr 21, 2026Locations: 2
Eligibility criteria

Aged 18 years or older; [+6]

Reported smoking abstinence in the 3 months preceding screening visit; [+9]

Status: Recruiting

Auricular Stimulation for Nicotine Withdrawal in Psychiatric Inpatients

The goal of this clinical trial is to evaluate the feasibility and preliminary effectiveness of auricular acupressure (ear seeds) combined with nicotine replacement therapy (NRT) in psychiatric inpatients (both male and female, aged 18-65) who are forced to abstain from smoking due to the smoke-free environment of the inpatient ward. The main questions it aims to answer are: * Does auricular acupressure significantly reduce the severity of nicotine withdrawal symptoms compared to standard care? * Can auricular acupressure effectively lower nicotine craving and anxiety levels in patients during their mandatory abstinence? Researchers will compare the experimental group (NRT plus active auricular acupressure) to a control group (NRT plus sham auricular acupressure) to see if the addition of ear point stimulation provides better relief for withdrawal distress. Participants will: * Receive standard nicotine replacement therapy (NRT) as prescribed by their physician. * Be randomly assigned to receive either Vaccaria segetalis seeds or sham materials on specific ear acupuncture points. * Be instructed to press the beads 3 times daily to stimulate the points for a period of 4 weeks. * Complete standardized assessments (MNWS, HAMA, and craving scales) at baseline and multiple time points during the intervention.

Participants needed: 60
Trial details
Age: 18-65Biological sex: AllType: InterventionalSponsor: Chiao-Chiao LiaoUpdated: Apr 13, 2026Locations: 1
Eligibility criteria

Psychiatric inpatients aged 18 to 65 years. [+5]

Presence of severe skin infection, open wounds, or lesions on the auricle (outer... [+4]

Status: Recruiting

Cannabidiol for Reducing Cigarette Use

The goal of this research is to evaluate the efficacy of cannabidiol (CBD) in reducing cigarette smoking. Although there are safe and effective treatments for smoking cessation, not everyone who attempts smoking cessation is successful, even with these treatments. Relapse rates are high, leaving a need for new approaches. Despite justification to evaluate CBD for this indication, human research on the topic is scant. Larger, more extended studies are warranted and essential. The investigators will recruit participants from CRI-Help, Inc., a substance abuse treatment program in North Hollywood, where residents who indicate the desire to stop smoking are prohibited from using other cannabis products which would affect recruitment. The aims of this study are: 1. Evaluate the effects of CBD on nicotine intake. 2. Exploratory Aims. Measure plasma concentrations of CBD, N-arachidonoyl-ethanolamine (anandamide) and 2-arachidonoylglycerol (2-AG) at baseline and day 7. Participants who meet eligibility criteria will take part in a 56-day treatment phase during which they receive the study medication under supervision (CBD or placebo twice daily) and complete questionnaires on side effects, withdrawal, craving and mood symptoms. Blood, breath, and urine tests will also be performed throughout the study. Participants who complete the treatment will also be assessed at 1-month and 3-month follow up visits.

Participants needed: 120
Trial details
Phase: Phase 2Age: 18-65Biological sex: AllType: InterventionalSponsor: University of California, Los AngelesUpdated: Apr 13, 2026Locations: 1
Eligibility criteria

Physiological dependence on alcohol or any drug, requiring medical detoxificatio... [+8]

Status: Recruiting

Cannabis-Tobacco Co-Use Treatment Study

The purpose of the RECLAIM study is to evaluate the effectiveness of varenicline (sometimes known as Chantix) compared to placebo (an inactive substance) for the treatment of cigarettes and cannabis (marijuana). Varenicline is not FDA approved for the combination treatment of cigarette abstinence and cannabis reduction or abstinence. All participants will also receive counseling and access to online treatment modules during a quit attempt for cigarettes and a reduction attempt for cannabis. This study is being conducted by the Medical University of South Carolina. All procedures are conducted remotely and there is no in-person visits are needed. To qualify, participants must be 18 or older, live in South Carolina, use cigarettes and cannabis, and are interested in quitting cigarettes and reducing cannabis.

Participants needed: 200
Trial details
Phase: Phase 3Age: 18+Biological sex: AllType: InterventionalSponsor: Medical University of South CarolinaUpdated: Apr 3, 2026Locations: 1
Eligibility criteria

Ages 18 and over (no upper age limit) [+7]

Any significant or acutely unstable medical, psychiatric, or substance use probl... [+3]

Status: Not yet recruiting

Quit-Smoking Study for Native Hawaiians

This study aims to help Native Hawaiian adults quit smoking by testing two common methods: nicotine gum and group-based counseling. Participants will be assigned to one of three groups: (1) nicotine gum only, (2) group counseling only, or (3) a combination of both. The study will take place at public housing sites on O'ahu. Researchers will check if these approaches-alone or in combination-can support people in successfully quitting smoking. The goal is to find out which method works best and is most acceptable in this community.

Participants needed: 75
Trial details
Age: 18-80Biological sex: AllType: InterventionalSponsor: University of HawaiiUpdated: Mar 31, 2026Locations: 1
Eligibility criteria

Self-identifies as full or part Native Hawaiian [+12]

Pregnant or nursing, or planning to become pregnant or breastfeed in the next th... [+4]

Status: Not yet recruiting

Effects of Nicotine Dependence on Multidimensional Health Outcomes

Nicotine, a major toxic component of cigarette smoke, together with carbon monoxide (CO), constitutes a significant environmental exposure with systemic effects. Beyond its addictive potential, chronic nicotine exposure may induce inflammation, oxidative stress, tissue hypoxia, and autonomic imbalance, potentially impairing respiratory muscle strength, functional capacity, and overall physical performance. Additionally, nicotine dependence has been associated with sleep disturbances, cognitive dysfunction, altered pain perception, and reduced quality of life. Although previous studies have examined individual effects of smoking on specific health outcomes, research addressing these multidimensional impacts within a comprehensive framework remains limited. Therefore, this study aims to investigate the relationship between nicotine dependence level and respiratory muscle strength, functional capacity, cognitive functions, pain, quality of life, physical activity level, and sleep quality, in order to provide a more holistic understanding of the clinical consequences of nicotine dependence.

Participants needed: 212
Trial details
Age: 18-65Biological sex: AllType: InterventionalSponsor: Izmir Democracy UniversityUpdated: Mar 16, 2026Locations: 1
Eligibility criteria

Regular cigarette use for at least the past 6 months [+3]

Presence of chronic respiratory diseases such as COPD or [+4]

Status: Not yet recruiting

Facilitation to Increase Tobacco Treatment

Smoking disproportionally impacts Veterans, and VA spends $2.7 billion annually on smoking-related health conditions. Veterans with serious mental illness (SMI) smoke tobacco products at triple the rate of Veterans without any mental illness and die 10-15 years earlier as a result. SMI Veterans who smoke want to quit and FDA-approved tobacco cessation medications are safe, effective, and readily available in VA. However, mental health providers are hesitant to treat smoking and just 11-18% of Veterans with SMI who smoke receive tobacco medication. External facilitation is an effective implementation strategy that can overcome barriers to integrating evidence-based treatment into routine clinical practice. In collaboration with local and operational partners, the proposed CDA-2 will evaluate and refine an external facilitation strategy to improve tobacco medication prescribing in VA SMI clinics. This proposal aligns with VA priorities to enhance timely access to care and improve Veteran outcomes.

Participants needed: 65
Trial details
Biological sex: AllType: InterventionalSponsor: VA Office of Research and DevelopmentUpdated: Mar 6, 2026Locations: 1
Eligibility criteria

VA Maryland Health Care System patient care providers serving Veterans in Critic... [+7]

None [+1]