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Re:“Cigarette smoking causes about one of every five deaths ... by adwi on Saturday September 16, 2017 @06:52PM (#15267191)
Source please.
Re:“Cigarette smoking causes about one of every five deaths ... by seasonalgrit on Saturday September 16, 2017 @09:03PM (#15267677)
i did not downvote you. asking for a source is not a bad thing.

in addition to what i posted above, this paper is a good summary of what we know at this point: doi:10.1038/nrc3725