New Scientist Cannabis link to mental illness strengthened - Breaking News:
"The link between regular cannabis use and later depression and schizophrenia has been significantly strengthened by three new studies.
The studies provide 'little support' for an alternative explanation - that people with mental illnesses self-medicate with marijuana - according to Joseph Rey and Christopher Tennant of the University of Sydney, who have written an editorial on the papers in the British Medical Journal.
One of the key conclusions of the research is that people who start smoking cannabis as adolescents are at the greatest risk of later developing mental health problems. Another team calculates that eliminating cannabis use in the UK population could reduce cases of schizophrenia by 13 per cent."