I have noticed that there are far fewer smokers in many pubs than there used to be, sometimes they are in the minority. recently I was in a session and there were about fifty people in the pub. One chap eventually arrived and promptly lit up and smoked pretty constantly all night. The smoke ended up everywhere in the pub by the end of the evening making it unpleasant for everyone else.
Now that's what I call selfish behaviour and I'm glad that the ban will stop this happening.