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Secondhand smoke, also known as environmental tobacco smoke, is a complex mixture of gases and particles that includes smoke from the burning cigarette, cigar, or pipe tip (sidestream smoke) and exhaled mainstream smoke.
Secondhand smoke contains at least 250 chemicals known to be toxic, including more than 50 that can cause cancer.
Health Effects of Secondhand Smoke Exposure
Secondhand smoke exposure causes heart disease and lung cancer in nonsmoking adults.
Nonsmokers who are exposed to secondhand smoke at home or work increase their heart disease risk by 25