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Cigarette smoke contains about 4,000 chemicals. Carbon dioxide, carbon monoxide, methane, and nicotine are some of the major components. Minor components include acetone, acetylene, formaldehyde, propane, hydrogen cyanide, toluene, and many others.
Sources: Involuntary Smoking, p. 6; Larson, David E., ed. Mayo Clinic Family Health Book: The Ultimate Home Medical Reference, p. 409; Prevention's Giant Book of Health Facts, p. 198.
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