Under the liberty-oriented method of private property, as a means to conflict resolution, we'd ask the question of ownership. If the owner wishes his restaurant to be smoke-free, it is his right. Whether a smoker is harmed or inconvenienced by not being allowed to smoke in his restaurant is irrelevant. Similarly, if a restaurant owner wishes to permit smoking, it is his right, and whether a nonsmoker is harmed or annoyed is also irrelevant. In the interest of minimizing possible harm either way, it might be appropriate for restaurant owners, by way of a sign or other notice, to inform prospective customers of their respective smoking policy. That way, customers can decide whether to enter upon the premises.
In today's America, the successful anti-tobacco campaign has become a template for conflict resolution through the forceful imposition of wills through the political system. It's part of a continuing trend of attacks on private property rights. Private property rights are the bulwark for liberty, and should be jealously guarded and not be sacrificed for the sake of expediency.