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Smoking also increases risk of cancer of the mouth, throat, larynx, and esophagus.
Plants produce nicotine to protect themselves from predators, and people use nicotine in pesticides for the same reason.
Cigarette smoking is responsible for more than 480,000 deaths per year in the United States, including an estimated 41,000 deaths resulting from secondhand smoke exposure. This is about one in five deaths annually, or 1,300 deaths every day.
On average, smokers die 10 years earlier than nonsmokers.