Secondhand vape plumes could form lung damaging radicals American Chemical Society Vaping Produces Far Less Second Hand Nicotine Than Smoking Respiratory Therapy Tobacco Smoke, Vaping, and Asthma AAFA.org Parents using e cigs expose kids to dangerous secondhand vapor Futurity Secondhand cigarette smoke is a combination of smoke from the burning end of a cigarette and the smoke breathed out by smokers. Exposure to secondhand smoke has been linked to cardiovascular disease, According to the American Heart Association, the risks of secondhand smoke from vapes are still being discovered. Learn about the dangers of secondhand smoke from vapes.