“Current knowledge on cannabis use in relation to stroke is based almost exclusively on clinical reports. By using a population-based cohort, we aimed to find out whether there was an association between cannabis use and early-onset stroke, when accounting for the use of tobacco and alcohol.
Conclusions—We found no evident association between cannabis use in young adulthood and stroke, including strokes before 45 years of age. Tobacco smoking, however, showed a clear, dose–response shaped association with stroke.”
http://stroke.ahajournals.org/content/early/2016/12/27/STROKEAHA.116.015565
“New Study: Cigarettes Tied To Increased Stroke Risk But Not Marijuana” http://www.weednews.co/new-study-cigarettes-tied-to-increased-stroke-risk-but-not-marijuana/