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The videos will be embedded within an online survey platform, immediately preceding the outcome assessment.",[36,30,47,27,24,40,44,33,21,15,18,9],[55],{"name":56,"affiliation":5,"role":57},"Jennifer B Unger, PhD","PRINCIPAL_INVESTIGATOR",[59,64],{"name":60,"role":61,"phone":62,"phoneExt":11,"email":63},"Jennifer B Unger, PI, PhD","CONTACT","(323) 442-7200","unger@usc.edu",{"name":65,"role":61,"phone":62,"phoneExt":11,"email":66},"Julia Vassey, PhD","vassey@usc.edu",[68],{"facility":5,"status":11,"city":69,"state":70,"zip":71,"country":72,"countryCode":73,"cosmosGeoPoint":74,"geoPoint":79,"contacts":80},"Los Angeles","California","90032","United States","US",{"type":75,"coordinates":76},"Point",[77,78],-118.24368,34.05223,{"lat":78,"lon":77},[81],{"name":82,"role":61,"phone":83,"phoneExt":11,"email":63},"Jennifer Unger, PhD","3233330580",{"type":57,"investigatorFullName":85,"investigatorTitle":86,"investigatorAffiliation":5,"oldNameTitle":11,"oldOrganization":11},"Jennifer Unger","Professor",[88],{"name":89,"class":90},"National Institutes of Health (NIH)","NIH","100645424","e-cigarette-social-media-marketing-and-its-perceptions-by-youth-100645424",false,"NCT07694739","E-cigarette Social Media Marketing and Its Perceptions by Youth","Evolution of Influencer-driven E-cigarette Marketing on Social Media and Its Effect on E-cigarette Perceptions and Use Patterns Among Adolescents","Inclusion Criteria:\n\n* 14-17 years of age,\n* English fluency,\n\nExclusion Criteria:\n\nNot meeting the following criteria:\n\n* 14-17 years of age,\n* English fluency,","ALL","14 Years","17 Years",{"count":102,"type":103},6000,"ESTIMATED","INTERVENTIONAL",[106],"NA","The proposed study will conduct two randomized between-subject experiments among 6,000 adolescents (per each experiment) recruited nationwide to test the effects of audio-visual features of e-cigarette influencer marketing on perceptions of influencer credibility, e-cigarette harm perceptions, appeal, and susceptibility to e-cigarette use. This protocol represent the first experiment.",[109],"Vaping","NOT_YET_RECRUITING","2026-07-17",{"date":113,"type":114},"2026-07-20","ACTUAL",{"date":116,"type":103},"2027-01-01",{"date":118,"type":103},"2030-12-30",{"name":5,"class":6},1]