Yeah, and it makes white women have sex with negro jazz musicians!
No, it does this:
ONE in four people carries genes that increases vulnerability to psychotic illnesses if he or she smokes cannabis as a teenager, scientists have found.
The study, led by Avshalom Caspi and Terrie Moffitt, of the Institute of Psychiatry at King’s College London, offers the best explanation yet for the way that cannabis has a devastating psychiatric impact on some users but leaves most unharmed. Scientists had suspected that genetic factors were responsible for this divide, but a gene had not been pinpointed.