Look at this study group. It's not of healthy people.

The findings are the latest to emerge from a multicenter study of 3,882 patients who survived heart attacks. In this report, 124 people reported using marijuana regularly. Of these, 37 people reported using marijuana within 24 hours of their heart attacks, and nine smoked marijuana within an hour of their heart attacks. After smoking marijuana, the researchers found that the relative risk of a heart attack increased by 4.8 times within the first hour but dropped to 1.7 times in the second hour, suggesting a rapid decline in the acute cardiac effects.
I'm telling ya', if you have a chance of having a heart attack while going for a jog, then maybe pot's not for you.

I found this:
* Newsgroups: sci.med.cannabis
* From: Michael Acord <[email protected]>
* Subject: Re: Cannabis & heart attack - Medical advices, please
* Date: Mon, 22 Apr 2002 20:39:50 GMT
* Organization: EarthLink Inc. -- http://www.EarthLink.net

While there are no guarantees in medicine, and myocardial infarction is
VERY multifactorial, it seems unlikely that the occasional use of
Cannabis would sustantially alter your cardiovasclar status. Cannabis
has been known to have a small effect on blood pressure, but the earlier
reports of heart attack being directly related to prior use of Cannabis,
the reports were, for the most part, bullshit.
A Sympathetic MD ;-}>
Here's the question that was asked:
Hi,
>
> thanks to take some of your precious time to read this.
>
> I've had a myocardial infarction due to a 100% blockage in the right
> coronary artery just two weeks ago.
>
> The problem has been solved using a stent wich keeps this artery open;
> Of course, I must take - forever if i've well understood what the
> cardiologists said to me - an anti blood platelets agregate drug, also
> a blood thinner drug (family of aspirin), a beta blocker...
>
> It remains a 50% blockage in another artery that can't be reached to
> put a stent in it (frontmost inter ventricular artery). It must be
> bypassed if the blockage increase.
>
> At last, as the blood blockage lasted more than three hours, the right
> ventricle has been damaged by necrosis.
>
> I've immediately stopped to smoke any tobacco - seems to be the major
> cause of the problem in my case according to what the doctor says.
> Hard for someone who smoked during 35+ years, but I hold it;
>
> I add that I've never drunk a drop of alchool, in any form, beacuse
> even a beer or a glass of wine makes me sick (apparently hepatic or
> stomach disorder).
>
> I must also say that the use of anti blood platelets agregate forces
> me to modify completely my everyday life: I must stop to practice the
> sport that I made almost everyday these last 30 years (motorcycling).
> Also, no more mechanic related hobby (even a shock with a hammer on a
> finger can be extremely dangerous).
>
> Due to the damages to my heart, I'm told that I'll never be able to
> work again (I'm 47).
>
> All this is quite hard. It really S****!
>
> So, here comes the BIG question for me:
>
> Can I continue to use some pot - of course in a way absolutely
> dissociated from tobacco, pure sticks, vaporizer, eaten,.. - to light
> my life a little? Or have I to stop it completely also??
>
> I'm the father of three, and I want to live as long as possible...
>
> Thanks by advance for your answers or comments.
>
> Apologies for my somewhat imprecise english.
>
> I look forward to reading you!
>
> Bye.
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