It's mentally addicting, yes.

I have friends who are on probation, and get drug testing every 21 days. They don't quit smoking. They smoke weed up until like ten days before there test, and most of the time, they end up smoking after that and just buying ready-clean.

And I'll tell myself that I don't want to throw any money on weed for a few days, and if I don't smoke, then I don't smoke....but then I'll be out and end up buying weed or throwing down on a blunt, then afterward I'll be like "Damn, I shouldn't have done that."

It's mentally addicting in that sense.