How do nicotine and tobacco cause cancer?

Tobacco smoke has at least 70 chemicals that cause cancer, also known as carcinogens. Every time you breathe in that smoke, those chemicals get into your bloodstream, which carries the chemicals to all parts of your body. Many of these chemicals can damage your DNA, which controls how your body makes new cells and directs each kind of cell to do what it is made for. Damaged DNA can make cells grow differently from how they are supposed to. These unusual cells can turn into cancer.

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