On January 1, all pubs in Maine went non smoking. Restaurants have been non smoking for a few years. So far, they are all still in business.
Seems to me it's a matter of ratio. Non smokers outnumber smokers three to one. Anyone who believes in democracy should have no problem going along.
A final point; if you are addicted to nicotine, it's YOUR problem and you have no right to make it mine.