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 Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London E Cigs and Second Hand Vaping: Dangers and Protections Myth Buster ~ "Second hand vape smoke" is actually water vapour and is not harmful to other people or the environment. #vape #vaping #vapeuk #ecigerette #smoke #quit Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC