In my visits since the partial smoking ban I did not see any loss of crowd. But being I am only focusing on BJ and derivative games, I probably wouldn't notice what was going on in the rest of the casino.
My first visit after the partial ban, the casinos were pleasant and reasonably smoke free. But on subsequent visits they were either not enforcing the ban or weaseling around it in such a way as to make it worthless, and the tables were indistinguishable from a smoking casino. I was getting the feeling it was intentional too, almost like they situated the non-smoking among the smoking to drive the non-smokers away.
I was discussing this with a PC on one trip, he was repeating the management line that the smoking ban was hurting business. I told him- oh is that so? Maybe the loss of business also has something to do with the fact that your games suck, your service sucks, and your casinos suck?