Seconding that; I have personal experience there. Don't get me wrong, it feels great and it isn't harmful to your body in the long run, but if you have an addictive personality (or if you just don't have a lot of drive to do anything), weed isn't the kind of thing you need to be involved in. The feeling you get from weed isn't the feeling of actually having accomplished anything. I'd much prefer the satisfaction of, say, winning a Nobel or a Pulitzer. Or a Fields Medal for us freaks over here in pure math.