Huh ? Is it unfair to expect truck drivers to put up with exhaust fumes ?
The way it used to be (for ages), bars were places where people smoked. Now if you can't stand cigarette smoke, why on earth would you want to work in a bar ?
You are getting this backwards.
Why should (for one example) musicians have to contend with second hand smoke? And if not a musician, what if working in a bar was the only sort of work you could find?
For ages everywhere was where people smoked. Times change as new information becomes available. I can still remember seeing my aunt smoke when she was pregnant, and there is a good possibility that was a contributing factor to my cousin being born prematurely. The standards from a more ignorant time no longer apply.