Uh, yeah, but you could always re-hydrate with water. Same at parties really, it's always smart to stay hydrated. It's a part of being responsible with your liq.
That being said, I live in Miami- the drug culture is literally all-encompassing here. It's mostly, at least in my group of friends, about experimentation- addiction isn't really a problem here. Dependence, definitely. But not addiction. Addiction is a consequence of trauma or emotional vulnerability. My grandfather lived under high-stress (of his own making, mostly) and was a paranoid schizophrenic, his alcoholism was a consequence. But the culture here approaches drug and alcohol use casually, as something to maintain a harmless relationship with. Most of the time people manage that- but it's not without failures.
Zegh, my condolences for your brother. I mean, everyone has their reasons for their habits, as a fatalist it's my opinion that no one deserves moral blame for their actions. I'm sure he's genuinely sorry for what he does. Still, it would take something big happening to him for him to change. Unless he's actually shown the consequences of his actions, he'll never will.