A gene implicated in schizophrenia risk is also associated with risk for cannabis dependence
http://medicalxpress.com/news/2012-10-gene-implicated-schizophrenia-cannabis.html
Also see ~Biological Psychiatry, Volume 71, Issue 2 (January 15, 2012) 

“Thus, the current findings may help to explain the already established link between cannabis use and the risk for developing schizophrenia“.

Got links to your research papers you have published in kind accompanied by PHD peer reviews? So where are they? Still waiting on you.......