What is a lethal dose heroin?

Answer 1

Any dose could be fatal to certain individuals, so "do you feel lucky? Do you punk?"

I am not sure there have been studies, I mean who would sign up to see what the lethal dose of heroin is.

I can see it all now:

Doctor: Was that dose lethal, sir?

Test Patient: No man, but that was cool, do it again!

Later, Doctor: Now was that dose lethal, sir?

Test Patient: Unresponsive

Still later, Doctor: Well he's still dead, I guess for Test Patient #1 that dose was lethal, Next Test Patient please.