Harvard Heart Letter

What a drag: The dangers of a daily cigarette

Research we’re watching Smoking just one cigarette a day appears to raise the risk of heart disease and stroke by between 48% and 74%, according to a study in the Jan. 24, 2018, issue of The BMJ. Researchers pooled data from 141 studies done in 21 countries and regions, together involving millions of people. They analyzed the risks associated with smoking one, five, or 20 cigarettes per day, taking into account age, sex,…

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