Young man gamer inhaling of a vapor with electronic cigarette.Vape flavor liquid chemicals.Use of e cigarettes in the home.Smoking and vaping negative Stock Photo Alamy Girl smoke vape, inhaling an e cigarette Stock Video Pond5 Mouth to Lung (MTL) Vs Direct Lung (DL) Inhale Explained E Cigarette Direct 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