re: Working shift work causes cancer, according to WHO

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smoking does NOT cause cancer... my HSE guy told me that

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Just learned this from an oncologist when dealing with my dad. Only a small percentage of people get cancer from just smoking. It's actually the smoking coupled with other things that causes it in the majority of people. The smoking increases the odds when exposed to other factors. In my dad's case it was working around asbestos when he was younger.