Also as an add on there was a Yale medical study that pointed out that younger grass users were more likely to move into opiate abuse and perscription drug abuse then non grass users.
There was also the same conclusion in terms of smokers and drinkers at a young age.
Ah there it is. Admittedly they even said that more research is needed, and I'm on board with more research into the effect of dope on young minds and addicts in a similar vein to tabacco and alcohol research.
This is by no means the smoking gun (no pun intended) that dope is a gateway drug, but there should be more research done.
http://www.ctpost.com/local/article/...ug-3805532.php