That's another thing that bugs me about Sinatra's on stage mannerisms. What's the deal with glamorizing smoking? Surely he knew that smoking could have nothing but a deleterious effect on his singing, yet somehow he apparently felt the need to convey what he must have considered is the "hip" attitude of a smoker. Did he actually really smoke off camera? Hard to believe. In this last show he expresses in a funny, yet no nonsense way, how very important music is (was) in his life, yet the prop that promises to snuff (pun intended) the vitality out of his art has to be present. No excuse that this 1966 program represented a different attitude towards smoking - Surgeon Generals reports had been in the public consciousness for some time.
Who in show business wasn't smoking at that time? Musicians especially. We even had a thread on this board about all those pictures of jazz musicians and their smokes. Sure, their was a warning about it, but these were indeed different times, that is no excuse, just a plain fact.
Honestly, it's not as if there isn't still a lot of that going on today. Plenty of the present day musicians/performers/actors are smokers.