In a recent study, BMJ 2018;360:j5855 researchers examined the association between smoking and heart disease or stroke in millions of generally healthy people (using 141 studies).
They found that even one a day caused 50% of the risk of smoking a pack, or 20 cigarettes a day! This was after accounting for other risk factors such as blood pressure and cholesterol.
Apparently tobacco is toxic even in very small doses!
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