So I'm three months in to this quitting smoking, and it's not so bad. I have quit for six months at a time twice and once for two years, so this isn't uncharted territory. I still slap at my breast pocket once or twice a day, either in response to a "usual cigarette" moment or in a moment of anxiety, but experience no craving. Smokers look odd to me, and I am surprised how few there are.
The major negative remains concentration. I am still aware of needing to focus on something difficult and being unable to have quite the sharpness I need, which a nicotine hit to the forebrain would remedy. It's not often, but it's uncomfortable when it happens.