You know, this is a very interesting subject.
PCs should be able to order differnt kinds of alcoholic beverage, with different effects.
If you drink a little, nothing will happen, if you drink some more then your vision will become clouded, if you drink too much, your character will begin to sing and stumble around by itself, and if you take that last beer your char will lose all his stamina and fall asleep on the floor.
That is the way of the dwarf