Well here in Australia (specifically the State of Queensland) we have had a Total smoking ban since July (this year, 2006) and I've been talking to many Club Owners/Managers where we play.
Roughly (this is my own observation) the following has happened:
Club patronage, at first, dipped by approx 10% - and now has (pretty much) got back to normal.
I say pretty much because one of 2 things happened...
1. The club/venue actually had new members/visitors come in (or back) to the clubs BECAUSE there was no smoke.
2. Some clubs are still "down" as rebellious, sulky smokers (gee I guess you can see which side of the argument I'm on - huh?) are holding "smoking parties" in their own homes in "protest".
I notice that (as a general rule) the clubs that have less people in them, and more "negativity" are in lower income areas.
I don't know how it is in other Countries, but generally in Queensland, people less educated and in poorer, working class areas tend to be smokers, and angry at "the man" for "taking away their rights" etc etc....
Should have happened years ago as far as I'm concerned.
Smoking is a sad ridiculous habit.
(yes, yes, just my humble, misguided opinion....)
Flame me now smokers!
P.S. My voice lasts all night now and no more filthy, stinking clothes after a gig!!!!