" Living " causes cancer. Unless you choose to live in a plastic bubble with purified air being pumped you are exposed to carcinogens. They are in the water, soil, air and food. If you lived 40,000 years ago you would have been exposed to them as well. People mined, smelted, smoked food and burned.
Cancer then killed you a lot more quickly and horribly. Too much exposure to any chemical compound will probably heighten the odds you will eventually develop cancer of some sort. Some have a genetic disposition for it as well.
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