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 Vaping isn't just vapor. It's an aerosol filled with nicotine and chemicals that go deep into your lungs and straight into your bloodstream. Many vapes contain: Highly addictive nicotine What Does Vaping Do to Your Lungs? Johns Hopkins Medicine Mouth to Lung (MTL) Vs Direct Lung (DL) Inhale Explained E Cigarette Direct