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Relative risk of myocardial infarction (smoking, COC)

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

Cigarette smoking increases the risk of myocardial infarction and stroke in women under 45 years old; the increase will be greater if the woman is also taking the combined oral contraceptive pill (COC)

  • the relative risk is increased by 10 or greater compared with non-smokers

  • relative risk in heavy smokers using COCs may be as great as 20


  • Factfile (1996). British Heart Foundation, 11/96.

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