Dave: "Smoking is an aid to creativity. I don't do the intense multi-day programming jags anymore, I can't without the cigarettes. The reason why, I think, is that the drug helps you tune out distractions. The smoke keeps interruptions away. Work that requires intense concentration is aided by things that push away distractions. But at our age, Zeldman and I are roughly the same age, after thirty years of smoking, to keep doing it would be suicide, and not far-in-the-future suicide, like it is for people in their twenties and thirties, but suicide in the near future. A few people get to smoke into old age, but it seems that most don't."
I agree that smoking can help concentration. I quit many years ago, and I'm pretty happy I did. Who needs concentration anyway? (By the way, I believe one of the the best ways to train your concentration skills is mediation.)