Post link to that. I don't believe you.
You don’t have to believe me buddy. From the Times London:
Claiming that this evidence is new is less than flattering to the pharmacologists and the psychiatrists who have been giving warnings of the hazards since the 1970s. This evidence would have been available to Blair since his schooldays. When he was at Oxford, the then Professor of Pharmacology was Sir William Paton. He was one of the world’s experts on cannabis. In the 1970s Paton and his colleagues published many papers describing their observations, which had led him to conclude that even regular social cannabis smoking could induce schizophreniform symptoms. He listed these symptoms and they would have made worrying reading for any parent. Paton also drew attention to cases in which schizophrenia seemed to have been precipitated by taking cannabis in people who had previously been apparently unaffected by any form of psychiatric or psychological problems, and in whom there was no evidence that they were carrying a genetic burden that might make them liable to schizophrenic breakdown.
In one series of cases Paton and his colleagues found that there were several instances in which for some reason the person had had a psychiatric assessment, although without at the time evidence of psychological problems. Later they used cannabis and this had coincided with a psychotic breakdown.
http://www.timesonline.co.uk/tol/life_and_style/health/features/article767214.ece