It's so simple either a "This is a Non-Smoking Bar" or "This is a Smoking Bar". What is so difficult about that? Why do they have to be such communists about this issue? You know what it is, non-smoking types think they are missing out on something (they are not of course, smoking sucks), they see people having fun, smoking and carrying on. They are brainwashed as much as the smokers are about cigs and being "cool".
These smoking bans are just pointless. Nicotine is a drug, when you deny people it just make it more precious, creating a stronger bond between the smoker and the smokes.