A meta-analysis of 75 studies found that women who smoked were 25% more likely than men who smoked to suffer a heart attack, and that the relative risk for women compared with men increased 2% for every year they smoked. Researchers noted in The Lancet that women who smoked were also twice as likely to die from lung cancer compared with men. They speculated biological differences play a role, saying women may absorb more toxic chemicals from cigarettes.

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