Cigarette smoking
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Cigarette smoking is the practice of burning tobacco and ingesting the smoke that is produced. The smoke is generally inhaled deep into the lungs.
The smoke may be inhaled, as is done with cigarettes, or simply released from the mouth, as is generally done with pipes and cigars. The practice is believed to have begun as early as 5000–3000 BC in Mesoamerica and South America.
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From wikipedia article on Tobacco smoking