So says a story for The UK Independent, here:
The long-suspected link between consuming cannabis and developing schizophrenia has been repeatedly confirmed by recent studies. Observers say that for cannabis the present moment is similar to that half a century ago when scientific proof of a connection between smoking tobacco and cancer became so strong that no serious doctor or scientist could deny it. ...
Sir Robin Murray, Professor of psychiatric research at the Institute of Psychiatry in London, says that studies show that "if the risk of schizophrenia for the general population is about one per cent, the evidence is that, if you take ordinary cannabis, it is two per cent; if you smoke regularly you might push it up to four per cent; and if you smoke 'skunk' every day you push it up to eight per cent".
If you were wondering why America is the way it is under Obama, you now know why.
