I can see both sides to this.
People may have a reasonable expectation that they can smoke in the room.. they may be foreign for example, as if that explains everything...
But anyway, people might expect to be allowed smoke, and may not ask for a smoking room, as why would they?, they may never have experienced a no-smoking hotel.
I live in a country where there is no smoking ban and I have travelled fairly extensively. I have yet to come across someone who has 'never experienced a no-smoking hotel' and would not ask for a smoking room if they were smokers - pretty much all hotels everywhere have smoking and no-smoking rooms, irrespective of their policies in public areas