I'm curious about the cigarettes too. There were a couple of scenes where the smoke was horrendous - if they were using real cigarettes surely they could be victims of passive smoking? Some people do still smoke, I realise that, but do the actors have to take up smoking to get the parts?
When I think about how I smoked in the 50s and early 60s, it must have been awful for people who didn't smoke. The tops of buses were for the smokers and you couldn't see through the smog! Also when we went to the pictures, the atmosphere was thick.
I gave it up in 1966, thank goodness.