As an x/pothead I think the person stops maturing and stops having goals or getting anything accomplished. And I have heard pot has 50 kinds of tar in it so eventually that will hurt the lungs. I was cross addicted. 1 was too many and 50 was not enough of anything.......legal or illegal.........by the grace of God go I.......and after my divorce from my XAH who continued to use after I found recovery, I see I was codependent (addicted to him).......whew.......wears you out.......but not anymore......I'm good just for today.......