Does Vaping Cause Secondhand Smoke? Vaping exposes user to harmful levels of particulate matter, study suggests CUNY Graduate School of Public Health & Health Policy While smoke and vapor may seem similar, smoke from burning delivers a harmful chemical punch due to its chemical reaction. Explore what's inside both and uncover the differences here: https: www.pmi.com our science the difference between cigarette Secondhand Vape Exposure: Effects, Who's at Risk, and More Scientists Warn Against Breathing in Secondhand Vape 'Smoke' Newsweek