people who drink coffee tend to live shorter, people who drink alcohol tend to live longer

[Moonman]

If he did actually have a heart attack, I bet there was caffeine or something in whatever he was drinking, or ginseng or some other kind of stimulant. Deaths from amphetamine alone are so rare they're almost exclusively limited to people with pre-existing heart problems or something.
In the UK, only 832 deaths related to amphetamine were reported over a 10 year period (1997-2007), which is something like 6 deaths per 100,000 users. Not very significant.