what os tobacco ? where it is obtained from write its two haful effects
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- Tobacco smoke contains more than 70 chemicals that cause cancer. Tobacco also contains nicotine, which is a highly addictive psychoactive drug. When tobacco is smoked, nicotine causes physical and psychological dependency.
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Tobacco is the common name of several plants in the Nicotiana genus and the Solanaceae family, and the general term for any product prepared from the cured leaves of the tobacco plant. More than 70 species of tobacco are known, but the chief commercial crop is N. tabacum.
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