New research in marijuana cultivation has pointed to a link between the absence of the cannabidol compound (CBD) in certain strains of skunk weed and the development of psychosis. The elimination of CBD through selective breeding increases the THC content, which may play a key role in the development of psychosis. Studies on the role of these two compounds have shown that “pure synthetic THC causes transient psychosis in 40 to 50 percent of healthy people. In stark contrast to THC, CBD appears to have an anti-psychotic effect.”

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