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Passive Smoking Exposure to secondhand smoke is called involuntary smoking, or passive smoking. Secondhand smoke is a mixture of the smoke given off by the burning end of a cigarette, pipe, or cigar, and the smoke exhaled from the lungs of smokers. This mixture contains more than 4,000 substances, more than 40 of which are known to cause cancer in humans or animals and many of which are strong irritants. Secondhand smoke is also called environmental tobacco smoke (ETS). This smoke can damage one's health even if one isn't a smoker. It is the third major cause of lung cancer. Research shows that the secondhand smoke that many people are exposed to is enough to prove fatal. Researchers have identified carbon monoxide and nicotine in environmental tobacco smoke to increase the risk to health. "There is a two-fold problem due to passive smoking". First, infants and young children suffer maximum...

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