Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC 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 Solving secondhand "vape smoke" at workand at home Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Characteristics of second hand exposure to aerosols from e cigarettes: A literature review since 2010 ScienceDirect