E Cigs and Second Hand Vaping: Dangers and Protections Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center 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% Avoiding Tobacco Smoke and E Cigarette Aerosol Is a Key Part of Asthma Management Asthma and Allergy Foundation of America