eli5: If tobacco is a leaf, why does it have so many substances known to cause cancer?

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* Source is the packaging I’ve just read for a pack of tobacco in the UK which says it has 70 cancer causing substances

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Anonymous 0 Comments

Plants make all kinds of weird chemical compounds to make them poisonous and prevent them from being eaten by bugs and deer and things like that. Those compounds do things to the body. Plus when its burned chemical reactions happen that change the structure of a lot of it into other things, which are harmful.

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