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 Second hand vape smoke linked to more asthma symptoms in kids Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Tobacco and Vaping Region of Durham Secondhand Smoke vs Vape: What the Science Says Vaping Indoors and How it Contributes to Sick Home Syndrome Bactronix