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Secondhand smoke is tobacco smoke that affects a nonsmoker. Secondhand smoke can come directly from a cigarette or other lit tobacco; it may also be exhaled by a person smoking.
Secondhand smoke is sometimes referred to as environmental tobacco smoke (ETS), involuntary smoking, or passive smoking.
Secondhand smoke contains the same cancer-causing and lung-damaging chemicals that affect smokers. Repeated exposure to secondhand smoke over many years can cause damage to a nonsmoker's lungs that is similar to that of a smoker's.
Secondhand smoke is the most important risk factor for cancer among nonsmokers, far greater than other known cancer-causing substances. Secondhand smoke is most harmful to:
Current as of: July 4, 2019
Adam Husney MD - Family Medicine & Michael F. Bierer MD - Internal Medicine, Addiction Medicine
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