from American Heart Association journal Stroke
Smoking has been associated with higher risk of a type of stroke caused by bleeding into the space between the brain and the skull—called subarachnoid hemorrhage or SAH. But it was unclear if smoking or another factor such as high blood pressure was the cause. Yale School of Medicine researchers reported in the American Heart Association journal, Stroke. They found the relationship between smoking and the risk of SAH rose twenty-seven percent in people who smoked up to twenty packs of cigarettes per year. Among those who smoked more than forty packs per year, the risk of SAH stroke was nearly three times greater than among those who did not smoke.