The largest amount of alcohol I drunk on single occasion was at about 3/4 litre of wine. Still walked home on my own, no problem. I occasionally drink one glass of of brandy (5cl) when invited to birthday party or something like that. It's a tradition here. I don't drink beer. I never smoked cigarettes. I never tried marihuana, nor any other drugs
... anything like that. Never. I have no problem saying 'no' when a friend wants to pour me another one. Or leave the full glass standing on the table, if he does not listen. The idea of consuming some substance with the goal of altering my mental state is alien to me. I should do something that reduces my ability to handle myself? No way. It would create danger for myself and people around me. That would be irresponsible.
If you think that responsibility or lack thereof is the deciding fator, then you really are a moron.
I do think that it is responsibility that stops me from getting drunk or experimenting with drugs. And I do think that with that approach I'm not going to become an addict. Does it mean I'm a moron?