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 Disposable E Cigarettes More Toxic Than Traditional Cigarettes UC Davis If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs. Is Vaping Bad For You? Side Effects, Risks, Nicotine, Marijuana Vaping: Learn the Facts Canadian Lung Association Vaping myths and the facts Better Health NHS