is smoking cigarettes really that bad Cigarette Addiction - The Silent Killer Smoking and Chronic Lung Disease:

For example, the presence of certain chemicals or metabolites have been shown in vitro to directly reduce or inhibit the growth of select bacterial species 49,50,51

Psychiatry 10, 675

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A case in point is Philip Morris International's USD 400 million funding commitment to the Foundation for a Smoke-Free World