I've quit multiple times for months to years at a time. I had no withdrawl symptoms at all. I stoped cold turkey. When I smoke I smoke hard core. Multiple times per day.

That being said. Weed is addictive. Only not AS addictive as other stuff.

If 50% of regular users of alcohol get addicted and something like 80% of cigarette smokers get addicted then for weed it would be near 15-20%.
To relate that to another substance, caffine is addictive to like 30% of the population.

Weed can be addictive, just not to very many people.