According to LiveScience, a study conducted by the Einstein Medical Center in Philadelphia suggests that marijuana users have an increased risk of a number of cardiovascular diseases, including strokes and heart failure. The study did have some limited parameters, pointing to the need for more research.
The study looked at the records of 20 million Americans between the ages of 18 to 55 who had been admitted to 1,000 hospitals across the United States and then discharged in 2009 and 2010. The patients who reported using marijuana were compared to those who did not. It turns out that marijuana users are 26 percent more likely to have a stroke and 10 percent more likely to have heart failure than those who did not use.