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Sidestream smoke is smoke which goes into the air directly from a burning cigarette, cigar, or smoking pipe. Sidestream smoke is the main component of second-hand smoke , also known as Environmental Tobacco Smoke or passive smoking. The relative quantity of chemical constituents of sidestream smoke are different from those of directly inhaled smoke, although their chemical composition is similar. Sidestream smoke has been classified as a Class A carcinogen by the U.S. Environmental Protection Agency.
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