I used to regularly take the Garuda flight from Gatwick to Bali. The last ten rows were for smokers who always seemed a jolly lot enjoying a cig and a beer. As a (reformed) non smoker I didn’t have a problem with the smoke which just seemed to disappear out the back of the plane.
I also agree with Tightslot, just what is the reason for not having a smoking area away from the non smokers?