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 Does vaping cause secondhand smoke? Doctors explain the side effects Tobacco Smoke, Vaping, and Asthma AAFA.org Tobacco Smoke, Vaping, and Asthma AAFA.org Think vaping is a safer choice? Think again! Vaping may look harmless, but it's loaded with nicotine and toxic substances that can increase blood pressure and raise the risk of heart Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London