Chemicals Breathing in someone else's smoke or vape isn't harmless. Secondhand exposure can affect your lungs, brain, and overall health. Protect your families and yourself. Inhalar el humo o el vapor de otra Secondhand Smoke and Electronic Cigarette Aerosol Resources US EPA Tobacco Smoke, Vaping, and Asthma AAFA.org Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Secondhand Smoke Tips to Navigate Life with a Smoker