The term chemical is really broad. A lot of things are chemicals. Cancer is typically caused by damage to the DNA of a cell so that when the cell divides it produces damaged copies of itself that don’t function correctly, often continuing to produce many damaged cells which form a tumour. Some chemicals cause this type of damage due to how they interact with cellular DNA, due to the particular properties of that specific chemical molecule they can get into the cell and damage it in a way to cause cancer, and others don’t.
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