Funny that BAA airports have none, people smoking outside means they won't be inside spending money!
It always makes me laugh when you see all the (perhaps desperate) smokers outside the terminals congregating around the signs proclaiming "NO SMOKING" .. As said if they were inside, they would be spending, or obliged to spend more like, what with BAA seeing terminals more as shopping centres than passenger terminals
. Those small self contained cubes with strong air extraction systems seem to be the way to go.
SHJ