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Cigarettes are one of the few products of any sort on the market that aren't regulated

Quitting smoking lowers the risk for oral cancer substantially within a few years

We conducted permutational multivariate analysis of variance (PERMANOVA) of weighted (taxa relative abundance) and unweighted (absence/presence) Unifrac distance matrices to compare overall oral microbial composition between tobacco users and nonusers and by tobacco type 56

The marijuana smokers were identified by a search through the Ottawa Hospital records, using the terms marijuana and cannabis. Then Revah and her colleagues determined which of the marijuana smokers had had the chest scan

Cancer Causes Control 22 , 7379 (2011)