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% Juul study shows secondhand vaping emissions are less toxic than cigarette smoke HEALTH Does vaping cause secondhand smoke? Doctors explain the side effects: Details below. The health risks of secondhand smoke are widely understood. But what about secondhand vaping? Researchers Warn of Potential Harm From E Cigarette Secondhand Vapor AZPM