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Broadly put, smoking releases around 5,000 chemicals, from which at least 70 are harmful enough to cause illnesses that might develop due to cigarette smoking, the foremost among them being various types of cancer

The way I think about it is that its a reward, so you get a dopamine surge when you use nicotine, and thats what keeps you doing it, Kruse said

Most previous studies did not measure psychiatric disorders [3][5], or restricted study inclusion to past year smokeless tobacco use rather than lifetime use [10], [11]

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