Asthma and Allergy Foundation Tobacco can be bad for your health even if you are not the one smoking. Breathing in the smoke can lead to many health problems. Vaping is Researchers Warn of Potential Harm From E Cigarette Secondhand Vapor AZPM Vaping refers to the act of inhaling and exhaling aerosol, often called vapor, produced by an electronic cigarette or similar device. These devices heat a liquid that usually contains nicotine, flavorings, and Secondhand Smoke and Electronic Cigarette Aerosols US EPA