“Like a criminal, a cancer cell starts its life as a normal cell and then goes bad. It does so because of changes to its DNA that we call mutations. It takes multiple mutations for a cell to turn bad and become a cancer cell; the number probably varies greatly from one type of cancer to another. Thus, a person can be born with one or two of these changes, creating a genetic predisposition to cancer. Other changes come throughout life — lifestyle habits, stress, obesity, or through exposure to chemicals that can induce mutations, such as smoking, asbestos, radon, vaccinations, or cooking fumes.” (with edits: educated, blogger omissions and additions) … from a CONVENTIONAL article (

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