Every year, more than 400,000 Americans die of illnesses related to their smoking, and so do thousands of non-smokers who have been exposed to secondhand smoke—a combination of smoke that comes from the burning end of a cigarette, cigar or pipe and the smoke exhaled by the smoker. Non-smokers who breathe in secondhand smoke take in the same toxic chemicals that smokers do, including more than 50 substances that are known to cause cancer in humans or animals. The more secondhand smoke a person is exposed to, the higher the level of these harmful chemicals in their body. For adults, the health effects of exposure to secondhand smoke include respiratory tract infections, lung cancer, nasal sinus cancer and heart disease.
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