Should I Be Concerned About Secondhand Vaping? 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% E Cigs and Second Hand Vaping: Dangers and Protections In secondhand vape, scientists smell risk American Heart Association Secondhand Vape Exposure May Be Risky for Asthmatic Teens UCT Lung Institute