I have watched this at our favorite bar/restaurant. The non smoking room, (behind glass, heh!), have people coming and going, somewhat. They eat, drink one drink and out they go. The smoking (bar) area, has people eating, having several drinks, talking, laughing having fun.
I know the longer we sit there, the better the tip for the waitress. I don't know......maybe the anti's hate seeing us having so much more fun. You think?