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Heres how smoking increases your risk of tonsil cancer: Carcinogens in Smoke: Cigarette smoke contains numerous carcinogens, chemicals known to cause cancer

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This study has several limitations

A video abstract (MP4 81,897 kb) Similar content being viewed by others Digital Features This article is published with digital features, including a video abstract, to facilitate understanding of the article

The tar content is 13mg per cigarette, and the nicotine content in smoke is 1.3mg per cigarette

This covers four billion people, which represents 71% of the global adult population