So I just found this on my puter. Pretty definitive study that i am always looking for on oral tobacco. Just thought I'd post it and some might book mark it, so I don't forever have to be the guy looking for it. If not Oh wells!
http://cro.sagepub.com/content/15/5/252.full
http://cro.sagepub.com/content/15/5/252.full
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