[qwytw]

I can't say much about 'personalities' but it has been quite consistently demonstrated that some people are genetically predisposed and more likely to become addicted to certain substances than others regardless of social factors or even (pre-addiction) consumption patterns.

[pnt12]

I also think there's something to it: each person is different.

I've smoked and quit a couple of times, and still get urges to go back sometimes. Meanwhile, I know people who casually smoke once in a while and don't get the habit.