I would say it's not black and white,
Becoming intoxicated is a personal choice, many people can do it without causing harm to themselves or others, in which case there's no medical or moral issue. If however your self-intoxication is causing harm to yourself and other, then I would say it becomes both a medical and a moral issue.
I'd also add that if you have become aware that your self-intoxication is very likely to cause harm to yourself and to others, it becomes much more of a moral issue and becomes your responsibility to knock it off. What I like about AVRT is the fact that you take this moral responsibility on yourself.