Carcinogens do not cause cancer at all times, under all circumstances. In other words, a carcinogen does not always cause cancer in every person, every time there is any kind of exposure.
Some may only be carcinogenic depending on how one is exposed to a carcinogen (for example, swallowing it as opposed to touching it).
Some may only cause cancer in people who have a certain genetic makeup (sometimes also called genetic predisposition). A genetic predisposition results from specific genetic variations that are often inherited from a parent. These genetic changes contribute to the development of a disease but do . . .
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