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Tobacco
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Tobacco,
chemically processed leaves that are smoked or chewed, increases blood
pressure and heart rate, and produces a calming effect on some users.
Long-term use leads to lung disease, heart diseases, stroke, as well as
cancer. Second-hand smoke contributes to cancer and respiratory illness
in non-smokers. Pregnant women who smoke increase the risk of developmental
damage to their babies. Nicotine is highly addictive; most addicted adults
begin smoking as teenagers.
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