Genome-wide association study of cannabis
 http://medicalxpress.com/news/2016-03-genome-wide-association-cannabis.html
Also see ~ Journal of the American Medical Association (JAMA). 

“cannabis dependence has a genetic risk component that may overlap with other psychiatric disorders“. 

I’m still waiting...tap...tap...tap for  your links to the research papers you have published in kind accompanied by PHD peer reviews. So where are they?