While I would be thrilled, personally, if there was a ship-wide smoking ban on RSSC cruises, I've never found it to be a problem for me. In our four previous cruises, I've never smelled smoke in our staterooms, nor has it been intrusive in any of the public areas.
I read somewhere that less than 20% of Americans smoke, and that recently even France is beginning to ban indoor smoking! Looks like a trend is developing.