Actually nicotine is apparently not the addictive part of smoking, rather other chemicals in tobacco are.
Anecdotally I can confirm I've smoked e-cigarettes quite heavily for a few months then stopped cold turkey and had zero withdrawal or cravings, but I occasionally feel a desire for smoking a cigar quite strongly despite having them at a rate averaging a few a year.
EDIT: Not majorly addictive, rather than not addictive at all.
