Full article: Pulmonary effects of e liquid flavors: a systematic review Predicting the pulmonary effects of long term e cigarette use: are the clouds clearing? European Respiratory Society About E Cigarettes (Vapes) Smoking and Tobacco Use CDC 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 COPD and Vaping: Understanding the Risks and Long Term Effects Cardiopulmonary Impact of Electronic Cigarettes and Vaping Products: A Scientific Statement From the American Heart Association Circulation