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Stroke
Secondhand smoke has been strongly linked to increased chance of a stroke. Regular exposure, such as living with a smoking spouse or working in a smoky environment, increases your risk of a stroke by 50 percent. Recent studies have indicated that the increased risk factor may be as high as 82 percent. The chemicals in tobacco smoke increase clotting factors in the blood, decrease levels of good cholesterol, increase triglyceride levels, and damage the lining of blood vessels. The risk level for stroke increases as the exposure level increases.

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