For the record: I have been on numerous smoking flights (I´d guess half of my total flights), the last time March this year. Oh, and I´m a non smoker, and a pretty sensible one.
For passenger comfort, smoking is not a real disturbing factor. One does not really notice the smoke in the back.
I am for a complete ban for three other reasons, though:
- a smoke free working place for the steward(esse)s: unlike me, a passenger in the non smoking section, they´ll have no choice but enter the smoking area. The less second hand smoke they get, the less they´ll be sick, saving the airline money and making my ticket cheaper
- cleaning costs, for which I pay too.