E Liquids Misleadingly Imitate Cough Syrups FDA what is in vape juice Can vaping damage your lungs? What we do (and don't) know Harvard Health What Does Vaping Do to Your Lungs? Johns Hopkins Medicine 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