I was going to say it's funny that part of society consider tobacco use a disorder while another part encourage it, but thinking about it more I realize it's mundane. The same thing is with junk food and overeating. And if a person gets drunk alone regularly, they're maybe considered an alcoholic, while doing so with other people is condoned.
A lot of this has to do with whether your issue causes any social problems (or, again, harmfulness to self or others). The college student who drinks himself stupid everyday may not be considered an alcoholic, but the parent who has one too many beers at dinner and then drives home, is stopped by the cops, and arrested “has a problem”, and may be an alcoholic for life. There’s a reason the rate of alcoholism is higher in suburbs and rural areas than in inner cities: people who live in inner cities don’t need to drive home after a night of drinking!
Another thing: drinking at night: ok. During the day: alcoholic.