Yes, that is what I really meant. My experience is from watching my significant other's kids and their friends (all in their early twenties by now, but were te

Yes, that is what I really meant. My experience is from watching my significant other's kids and their friends (all in their early twenties by now, but were teens when they started). So the age could have something to do with it too. And every once in awhile I run across someone who does mention occasional pot usage, but they seem normal. In those cases their use is infrequent. In the case of the teenagers / early 20's mentioned above, I think a big part of it is heavy usage while their brains were still developing. It seems that usage during those critical years can put a "pause" button on development, so once they got off pot they were 25-year-olds that behaved in many ways like a 15-year-old. A good counter example is someone I know who didn't start until around age 25, only indulges occasionally (so it isn't an addiction), and has very high cognitive ability (currently making 6 figures in the financial industry).