I must say that in my experience there is considerable non-containment of cigarette smoke within the designated smoking "rooms" which AENA has constructed at Spanish airports since the law changed there. These rooms appear to have ventillation systems but the smoke typically pollutes much of the surrounding vicinity. I can think of one gate area in Terminal 4 Barajas, used for Iberia's Spanish domestic flights, which is particularly unpleasant in this regard.