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% The Impact of E Cigarettes and Asthma: What You Need to Know Vape Smoke 220w Risk From Second Hand Smoke On Children Greater Than Previously Thought Second Hand Smoking From Vaping