Second Hand Smoke

Just as bad as smoking?

Tobacco smoke contains more than 7,000 chemicals, including hundreds that are toxic and about 70 that can cause cancer. So yes it can lead to cancer.

Between 70% and 90% of non-smokers in the American population, children and adults, are regularly exposed to secondhand smoke. It is estimated that only 15% of cigarette smoke gets inhaled by the smoker. The remaining 85% lingers in the air for everyone to breathe
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If a person spends more than two hours in a room where someone is smoking, the nonsmoker inhales the equivalent of four cigarettes.
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Secondhand smoke is the third leading preventable cause of disability and early death (after active smoking and alcohol) in the United States. For every eight smokers who die from smoking, one innocent bystander dies from secondhand smoke.

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Secondhand smoke contains twice as much tar and nicotine per unit volume as does smoke inhaled from a cigarette. It contains 3X as much cancer-causing benzpyrene, 5X as much carbon monoxide, and 50X as much ammonia. Secondhand smoke from pipes and cigars is equally as harmful, if not more so.
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Citations

"Division of Periodontology: Tobacco Use Cessation Program." Division of Periodontology: Tobacco Use Cessation Program. N.p., n.d. Web. 22 Mar. 2015.