The problem is a race to the bottom happens. Smokers tend to drink more and are quite… militant in their opinions on where to go. Basically non smoking pubs would suffer, and so likely allow smoking, ruining it for everyone else.

It doesn’t help that those left smoking cigarettes, in the UK, tend to be the rudest, most inconsiderate of the original group. The average heroin addict is considerably more polite than the average cigarette smoker now.