Pure nicotine (ecigs) and pure caffeine, on the other hand, are much easier to keep in check or quit.
The craving to take a puff from an ecig is almost nonexistent compared to the massive drive to get cigarettes. I would walk miles for them just to light one up.
Same goes for energy drinks. They are addictive as hell, but the addiction is not caused by caffeine alone — rather, the massive interaction between monoamine oxidase inhibition and caffeine’s stimulant effects.
It wasn't so much a craving, more that I would getting a headache if it started getting too long between sessions. Sometimes it would show up within a half hour.
I just attributed it to Big Tobacco finding clever ways to make the hit so much more satisfying in cigarettes and the mom and pop ecig blenders hadn't figure them out yet.
I had splitting headaches and trouble sleeping for a week then it was done. Cold turkey is the way to quit nicotine imo. Patches, gum, ecig, etc, are all just ways to drag it out and spend more money on nicotine, with the side chance of still being addicted. Cigarettes aren't heroin. It's gonna suck but then suddenly it won't.