Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London 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% Vaping Possible Negative Effects on Lungs: State of the Art From Lung Capacity Alteration to Cancer Cureus Tobacco Smoke, Vaping, and Asthma AAFA.org Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA