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% Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Secondhand Vape Exposure May Be Risky for Asthmatic Teens UCT Lung Institute