Chen-Sankey JC, et al. - Among nationally representative samples of youth (ages 12–17; n = 8,121) and young adult (ages 18–24; n = 1,683) never tobacco users from the Population Assessment of Tobacco and Health Study (wave 2; 2014–2015 and wave 3; 2015–2016), researchers estimated the longitudinal link between electronic cigarette (e-cigarette) marketing exposure and e-cigarette experimentation in the US. At wave 2, prior-month exposure to e-cigarette marketing via many places (eg, Web sites and events) and at wave 3, e-cigarette experimentation, were measured. Past-month exposure to e-cigarette marketing was stated by 70.7% of youth and 73.9% of young adult never tobacco users, at wave 2. Experimentation with e-cigarettes was reported by 4.9% of youth and 4.5% of young adults, at wave 3. Among youth and young adult never tobacco users, the subsequent e-cigarette experimentation was predicted by e-cigarette marketing exposure. In these populations, a minimized exposure to e-cigarette marketing messages may be achieved by increasing restrictions on marketing through various channels.