How do you know that it isn't addictive? Tons of rappers use it alot (including that dude "Wiz Khalifa") I don't listen very much to rap.
A lot of people I know smoke it. However only 1 of them is severely addicted, to the point where major counselling is needed.
The rest smoke it extremely casually, less than once every couple weeks.
From what I've experienced with it is that it isn't addictive, or at least is addictive, but in a very insignificant way.
No it can't
It can. Withdrawals are pretty hard to go through. Plus, it's can be a cheap high for some, and cheap things are good for broke people. However like Joker Card said, it can only addictive if you smoke it daily, or more.