On stage, we just want to generate hysteria. We don't care about looking cool or posing.
I categorically resist this idea that films are supposed to be autobiographical and the only stories you tell are about your own life.
Men even contract the dirty, filthy habit of chewing tobacco, and when the habit gets a good hold upon them they are never satisfied except when they have a wad of the stuff in their mouth. So with drinking. It is largely a habit.