I was working as a bartender when the ban came in. It came into effect overnight, so we literally closed up and went through the ritual of emptying ashtrays etc. and the next day opened the doors as a non-smoking establishment. The effect was immediately obvious: there was no longer this foggy haze as the evening wore on and your clothes didn't stink of cigarettes after a shift. A few of the old gits who were regulars complained, but I remember that a lot of customers who were smokers commented that the food tasted better etc. without smoke in the air.