Well, I'm not arguing that "forall" drug users, large negative effects exist... you're only showing that "there exists" at least one drug user where large negat

Well, I'm not arguing that "forall" drug users, large negative effects exist... you're only showing that "there exists" at least one drug user where large negative effects exist. We're really arguing magnitude - I imagine we probably disagree on which side of the scale the magnitude is heaviest. But beyond that, yeah I agree that it would require the right tests, and that definitely gets beyond my knowledge.