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 Secondhand smoke from vaping could be harmful to children: study ABC13 Houston Second Hand Vaping: Minimal Impact Compared to Smoking Do electronic cigarettes create thirdhand chemical residue? Thirdhand Smoke Resource Center