"We really need to look more closely at the effects of smoking and nicotine, not only on physical health but on mental health, too," says Richard A. Grucza.  "We don’t know exactly how smoking influences suicide risk. It could be that it affects depression or increases addiction to other substances. We don’t know how smoking exerts these effects, but the numbers show it clearly does something." (Credit: Kevin Standlee/Flickr)
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