Juul study shows secondhand vaping emissions are less toxic than cigarette smoke Millions of people are exposed to secondhand smoke every day. People living in multi unit housing are some of the most exposed. The only way to fully protect people from secondhand smoke at How can I protect my child from thirdhand smoke in homes? Thirdhand Smoke Resource Center Scientists Warn Against Breathing in Secondhand Vape 'Smoke' Newsweek