MarijuanaNews note: On the basis of the numbers presented here, the risk would appear to be a little less than 50 in a million for someone with heart disease. If the risk is 10 in a million for someone with no heart problems, and it is 4.8 times greater with heart disease, then it would be 48 in a million with heart disease. What kind of "dangerous game" is that? How does that compare with the risks in using other substances and other activities?

Marijuana typically makes the heart speed up by about 40 beats a minute. Whether this is how it contributes to heart attacks is unclear.
(MarijuanaNews note: Not all marijuana users experience such an increase.)