I don't buy the "addictive personality" shtick I played WoW on and off for 4 years and frankly it was nothing to put it down and do something else, I'm beginning think "addictive personality" is code for unemployed or student sure its a fantastic time sink but addictive? No chance, being comfortable with something is not the same thing as being addicted it's easy to fall into a routine of wake up, boot wow - 12 hours pass, go to sleep, repeat if you have nothing else going on in your life, but from a former smoker of 5 years nothing about about it racks your body or mind to the point of bad withdrawal maybe boredom at best.
Not picked up a cigarette in a year and a half and still get the craving to spark up if I get so much as a whiff.