"...allow any business that wants to cater to smokers to do so. "

And delivery men? And guys who repair things like plumbing & refrigeration units? And building inspectors? etc.... ALL these people have go into most commercial buildings, often for extended periods.

It is much more complicated than just 'allowing smokers to damage themselves if they wish'.

There are many laws to protect the public from their own stupidity in other areas; regarding drugs they are allowed access to; places and speeds they are allowed to drive; even the amount of 'noise' in workplaces without protection.

It took many years for research to prove that smoking, including 2nd hand smoke, was harmful as well as 'unpleasant' for many of us, and now that there is almost universal acceptance of the health problems of tobacco, people need to quit fighting the efforts to reduce PUBLIC restriction while we work on a gradual total ban!