Yeah, but millions of people's hearts fail each day, and they die. If they had just drank a glass of non-poisoned apple juice, and they died, the apple juice didn't cause it, it just happened to be a coincidence.

Or, if your heart fails, and you die, while watching The Real World on MTV. It's not MTV's fault, just a coincidence. You can't overdose from marijuana, but you can still die while you're high. That would be kick ass if you were invincible while high though...