Interesting. I’ve found both tobacco and coffee to be extremely addictive and habit-forming, as well as various other mixtures of caffeine and MAOIs (e.g. energy drinks bombed to hell and back with flavonoids).

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.