Overview
CONTRACEPTIVES:
Oral contraceptives (birth-control pills) are used to prevent pregnancy. Estrogen and progestin are two female sex hormones. Combinations of estrogen and progestin work by preventing ovulation (the release of eggs from the ovaries). They also change the lining of the uterus (womb) to prevent pregnancy from developing and change the mucus at the cervix (opening of the uterus) to prevent sperm (male reproductive cells) from entering. Oral contraceptives are a very effective method of birth control, but they do not prevent the spread of human immunodeficiency virus [HIV, the virus that causes acquired immunodeficiency syndrome (AIDS)] and other sexually transmitted diseases.
Cigarette smoking increases the risk of serious side effects from oral contraceptives, including heart attacks, blood clots, and strokes. This risk is higher for women over 35 years old and heavy smokers (15 or more cigarettes per day).
If you take oral contraceptives, you should not smoke.
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