Cigarette smoking is the #1 preventable risk factor for stroke. The nicotine and
carbon monoxide in tobacco smoke reduce the amount of oxygen in the blood.
They also damage blood vessel walls, making clots more likely to form.
Cigarette smoking increases the risk of coronary heart disease by itself. When it
acts with other factors, it greatly increases risk.
Other factors include high blood cholesterol, high blood pressure, physical inactivity, obesity and diabetes.
Smoking increases blood pressure, decreases exercise tolerance and increases the tendency for blood to clot.
Cigarette smoking is the most important risk factor for young men and women. It produces a greater relative risk in persons under age 50 than in those over 50.
Women who smoke and use oral contraceptives greatly increase their risk of coronary heart disease and stroke compared with nonsmoking women who use oral contraceptives.
Smoking decreases HDL (good) cholesterol. Cigarette smoking combined with a family history of heart disease also seems to greatly increase the risk.
19% of California adults were smokers in 1999.
Sources: American Heart Association.
CA Dept. of Health Services
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