Do you have a source for this? I did a quick search, but couldn’t find anything obvious to my untrained eye. Some links suggest that there’s a link, but that the causality might run in both directions.
Mainly it seems there is a correlation for those with pre-existing mental problems, or those who are disposed to mental illness but have no symptoms. I advise again that it is unpredictable who are in the latter group.
Do you have a source for this? I did a quick search, but couldn’t find anything obvious to my untrained eye. Some links suggest that there’s a link, but that the causality might run in both directions.
Here is a recent German study strongly linking onset of Schizophrenia and other psychotic symptoms with cannabis use: http://www.bmj.com/content/325/7374/1212?tab=full
And an older Swedish one (I can’t seem to find the full article): http://www.thelancet.com/journals/lancet/article/PIIS0140-6736%2887%2992620-1/abstract
Mainly it seems there is a correlation for those with pre-existing mental problems, or those who are disposed to mental illness but have no symptoms. I advise again that it is unpredictable who are in the latter group.
ETA: Wikipedia has an okay “state of the science” article: http://en.wikipedia.org/wiki/Long-term_effects_of_cannabis