Excerpt via link you provided : comment section :
"The "marijuana/schizophrenia" connection turned out to be an incorrect conclusion from the initial observation that several schizophrenic patients consumed marijuana. Prohibitionists jumped on the idea that showed marijuana caused schizophrenia, and the media belched it out.
It turns out, some schizophrenic patients were actually self-medicating with cannabis. Further research has shown most schizophrenics obtain effective relief, while a few get aggravation of their symptoms.
But prohibitionists love this false causation idea so much they continue to cling to it, as this person does.
This is another disturbing piece of anti-marijuana propaganda that displays such a highly politicized distortion of science at Scientific American that it smells tremendously of corruption. That's incredibly sad." Username: jontomas