Associations between perceived source credibility, e-cigarettes, and e-cigarette ad perceptions

The use of e-cigarettes among U.S. adults remains high, and aggressive industry advertising is a contributor. Consumer opinions of the e-cigarette industry's credibility can influence e-cigarette product and ad perceptions. The purpose of this study was to examine the association of perceived source credibility of e-cigarette ads and consumer attitudes toward e-cigarette ads and product use. In October 2021, we conducted a survey using an online convenience sample (N = 497, M_age = 31.9). Participants viewed two randomly selected e-cigarette ads and were asked questions regarding source credibility, perceptions of the ads, and e-cigarette use. Linear mixed effects models with random intercepts were used to estimate associations between perceived source credibility with perceived ad relevance, effectiveness, liking, product use interest, and e-cigarette harms perceptions. We also tested whether associations between perceived source credibility and ad and e-cigarette perceptions were moderated by e-cigarette use. Models controlled for cigarette smoking status, age, sex, race, ethnicity, sexual orientation, and income. Perceived source credibility was positively associated with increased perceived ad relevance, effectiveness, liking, and product use interest (ps < 0.001). E-cigarette use moderated associations of perceived source credibility and perceived ad relevance, perceived ad effectiveness, and interest in using e-cigarettes, with associations being strongest among never users. Findings suggest that tobacco control messaging aiming to reduce the credibility of the e-cigarette industry might be most effective among adults who have never used e-cigarettes.