Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Secondhand e cigarette vape smoke exposure increased in last 4 years, contain harmful toxins: JAMA Network study ABC7 Chicago Health effects of electronic cigarettes Wikipedia According to a Centers for Disease Control and Prevention (CDC) study, 40% of U.S. adults believe that children's exposure to secondhand aerosol from e cigarettes causes only some or little harm, and 5% More middle and high schoolers are getting exposed to secondhand vape aerosols, study indicates The Boston Globe