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http://abcnews.go.com/Health/story?id=117399I don't think marijuana causes plaque on his heartand they say weed is harmless
A new study from Boston's Beth Israel Deaconess Medical Center and Harvard Medical School says marijuana increases the risk of having a heart attack within the first hour of smoking to five times that of non-smokers.
Within the second hour, the risk declines to 1.7 times normal; and returns to an average risk after 2 hours.
The study, lead by Beth Israel director of cardiovascular epidemiology Dr. Murray Mittleman, is reported in this week's issue of the American Heart Association journal Circulation.