It's also illegal to smoke in doorways. At session last night everyone could smell the smoke drifting back from the pub doorway through saloon-type doors. The bar tender had to use some heavy persuasion to move the smoker out into the street, where it was pouring with rain!
I had this theory that smokers would give up, faced with the discomforts of hanging around outside pubs in the freezing cold or pouring rain, but seems they prefer to martyr themselves still further in pursuit of their journey to ill-health. And I've heard it's led to new relationshiops being struck up, divorces, etc, as smokers congregate outside whatever buildings.