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 Tobacco Smoke, Vaping, and Asthma AAFA.org E Cig Vapor Or Secondhand Smoke: Which Is Worse For You? Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Secondhand vape exposure: Risks and side effects