From my understanding of pot, one effect is constriction of blood vessels and arteries carrying oxygen and vital nutrients to the brain and other vital organs.
Now... take a person with high cholesterol and hardening of the arteries (atherosclerosis) and they have a heart attack, collapsed arteries or blood vessels, or they have a stroke.
Since pot is illegal, I suspect most people don't admit to their physician to it as a contributing factor, provided their still alive or capable.
YOu are 100% wrong, for one marijuana prevents plague build up in the brain.
It also opens up blood vessels, and lower blood pressure. So if going by your logic, you could say it may prevent heart attacks.
The problem is you can get articles on both sides of the issue, so your left with...
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Hence, this leads to an increased likelihood of a stroke in the brain (clot that originated in the heart). It also increases the possibility of a small clot forming in the heart, which could also then travel to the arteries surrounding the heart and cause a heart attack.
Marijuana's Effects on the Heart - Associated Content - associatedcontent.com
Show me one case where this happened?
And you know how your eyes turn red when stoned? That is blood vessel dialation.