Earlier quoted context omitted.
I believe it's called "tapering off" The cravings go away as the dosage goes down, since a sip isn't enough to increase or maintain tolerance.
Actually, nicotine has a rather short half-life of about 2 hours [1], which means even smaller doses quickly restore it close to previous levels. So in essence, tapering off is like going through many shorter withdrawals (doesn't sound scary but its actually a bit of a torture compared to quitting cold turkey). [1]: http://legacy.library.ucsf.edu/documentStore/m/a/u/mau01c00/...
Edit: > which means even smaller doses quickly restore it close to previous levels
Not for me it doesn't. I'm quite aware of how much nicotine I have in my system and what effect it's having.