Associations Between Early Onset of E-cigarette Use and Cigarette Smoking and Other Substance Use Among US Adolescents: A National Study

This study examines the associations between early onset of e-cigarette use and cigarette smoking and other substance use behaviors among US adolescents. Data were collected via self-administered questionnaires from a nationally representative sample of 2299 US high school seniors attending public and private high schools during the spring of their senior year in 2015 as part of the Monitoring the Future study. A higher percentage of adolescents...