A lot of performers are limited to non-smoke venues. I'm one. Even the ones that are ostensibly non-smoking often have smoke drifting in from other parts of the building because of designated smoking areas in the proximity. Also, chemicals are in the walls from the smoking-allowed shows. Even if a venue owner designates a non-smoking show, if he/she also has smoking shows, the stuff is residual and the place smells like an ashtray.
I see this as a kind of tyranny that penalizes performers that choose to be healthy by forcing them to breathe side-stream smoke.
Peggy Lee had emphesyma and didn't smoke.
Frank