I lose track of time all the time, now. I could tell you exactly when it was when I was smoking. A cigarette every hour, approximately, put a chemical rhythm in the day. A beat, as it were. My focus is much worse. I'm much hungrier. I gained forty pounds(~18kg or 2.8 stones). Only manged to lose about 15 of them off max, thus far. Those are an anchor too. I hate work alot more. Every hour before I got a quick win. Quick win, go get something done, quick win, go get something done. And Boots is right, the quick wins involved checking in with co-smokers. We got a lot of crap done during those breaks. Networking across functional departments at a university, learning institutional breadth, building relationships that worked and were fun. Those atrophied and died when I quit. Then the campus smoking ban rolled in and the rest of them atrophied as well. I have no idea what it would be, but I would put money on real productivity and job satisfaction having been lost with the extinguishing of the smoking nooks. I go outside less, I leave the house less, I don't chat up people at the store where I would pick up my daily ration. Socially speaking? Quitting smoking hurt my brain significantly.