The study cannot prove causation and did not include smoking of nontobacco products, alcohol consumption, or physical activity.
“While complete cessation of smoking is the goal, even reducing the number of cigarettes smoked may have beneficial health effects,” wrote Ms. Markidan, a medical student at the University of Maryland, Baltimore, and her colleagues.
SOURCE: Markidan J et al. Stroke. 2018 May;49(5):1276-8.