The difference in going to a bar and going to a pot smoking lounge is this: I can go with a friend to a bar and drink coffee, a Virgin Mary, or a Shirley Temple.  If I go to a pot lounge, I am going to get 'high' whether I want to or not.  So those going to those places are there for one purpose: to get high, and to what degree is not in their control.  Bars are often a social gathering place for drinkers and non-drinkers, not so pot lounges.