Evidence Mounts About the Health Impact of Second Hand Vaping Bisnar Chase Health Risks of Secondhand Smoke and Aerosols Factsheet US EPA Breathing in someone else's smoke or vape isn't harmless. Secondhand smoke exposure can affect your lungs, brain, and overall health. Protect your families and yourself. Inhalar el humo o el vapor de 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%