Exposure to e-cigarette health claims and association with e-cigarette use and risk perceptions: A cohort study of young adults.

INTRODUCTION: E-cigarettes have been marketed illicitly as smoking cessation aids and reduced risk tobacco products in the United States. Our study assessed consumers' exposure to such claims and evaluated their impact on relative risk perceptions and e-cigarette use.
METHODS: Data are from the Assessment of the post-College Experience study, which followed a cohort of young adults since 2010 when they were college freshmen. We used data from survey waves 10 (fall 2017) through 14 (fall 2019) to assess past 6 month exposure to e-cigarette marketing that made smoking cessation or modified risk tobacco product (MRTP) claims. Logistic regression models examined if exposure to claims at waves 11 through 14 were predictors of e-cigarette use and relative risk perceptions at wave 14.
RESULTS: Exposure to MRTP (28.4% to 40.1%) and cessation claims (29.1% to 46.6%) increased, with participants reporting more exposure to cessation than MRTP claims at each wave. Multiple exposures were associated with perceptions that e-cigarettes are less harmful compared to cigarettes (Cessation: AOR = 1.12, CI: 1.01-1.23; p = 0.025; MRTP: AOR = 1.16; CI: 1.05-1.29; p = 0.003). Neither claim type was associated with past 30-day e-cigarette use. Claim exposure did not increase e-cigarette initiation among never e-cigarette users. However, current cigarette smokers who had never used e-cigarettes at wave 10 had 2.5 higher odds of initiating e-cigarette use by wave 14 for each exposure to a cessation claim (AOR = 2.53; CI: 1.43-4.45; p = 0.001).
CONCLUSIONS: Young adults reported increasing exposure to unauthorized e-cigarette health claims. Exposure was associated with reduced relative risk perceptions, but was not associated with past 30-day e-cigarette use. Cessation claims may motivate current cigarette smokers to try e-cigarettes.