Why does for example smoking cause cancer? How do various toxins in general make your body start growing cells uncontrollably?
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Some of the products from cigarette smoke are capable of clinging on to the DNA strand and causing damage; kind of like how a key in your car’s ignition is normal and doesn’t cause any problems, but when you start adding a bunch of heavy keychains and other decorations, it can pull it out and break things.
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