When the ban was first instituted in Virginia there was a lot of pushback from restaurant and bar owners, but not many were willing to put their money where their mouth was and invest in separated HVAC systems. For the most part the handful that exist now are smoking-focused, e.g. cigar and whisky bars, which just aren't that popular any more. The one bar I remember well never did better business than the non-smoking bars around it and closed after a few years.