The problem is Medical Marijuana is now Big Business and no one is monitoring or educating users about warning signs. We all know the hazards of drinking but nothing is being done to warn people flooding into Legal Marijuana stores. They should be warned that 10-15% will become cannabis psychotic - hostile, withdrawn, loss of motivation, false memory, anxiety ,paranoia...
http://cannabisandpsychosis.ca/more-information/what-do-we-know/psychosis/what-is-psychosis/
Every medical-marijuana state but (for the time being) California requires a bona fide medical recommendation.
From your site:
“Given the extensive evidence it is relatively safe to say that cannabis use is not a necessary cause for psychosis as the statistics have failed to show that all adults with psychosis related illnesses used cannabis as a young person and nor is it a sufficient cause- as the majority of adolescent users did not develop psychosis in adulthood.”