Secondhand Smoke and Secondhand Vaping: Both Bad for Kids University Hospitals Early research says secondhand smoke from vaping may not be as bad as cigarettes, but it's still not harmless. https: fox59.com news national world does vaping cause secondhand smoke doctors explain the side effects 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 Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC