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Men under 50 years old who smoke are 88 percent more likely to have a stroke than men who never smoked — and the number of cigarettes a day can move that risk up or down, according to new research.

The study [...] involved 1,145 men ages 15 to 49, including 615 men who had had a stroke. When the numbers were broken down by cigarettes smoked, those who had less than 11 cigarettes a day were 46 percent more likely to have had a stroke.