I saw the original article while back in 2005, here is a quote pertaining to it:
An analysis of research studies with long-term, recreational users of marijuana has failed to reveal a substantial, systematic effect on the neurocognitive functioning of users. According to researchers at the University of California, San Diego (UCSD) School of Medicine, the only deleterious side effect found was a minimal malfunction in the domains of learning and forgetting.
The findings were particularly significant considering the movement by several states to make cannabis (marijuana) available as a medicinal drug, and questions regarding its potential toxicity over long-term usage.
http://alcoholism.about.com/cs/pot/a/blucsd030628.htm
So in short cannabis seem to affect the short term memory essential for learning capabilities, the original article also mentions that the short term memory does come back to normal provided the subject quits pot smoking. Feel free to google it up, this study really made waves when it came out 5 years ago. As for the schizophrenia and the so called hash psychosis it seems like one would have to be predisposed to that.
Hell some people would probably go mental from staring at an elevator, especially if they were standing at the bottom of the elevator shaft and the lift, its cables corroded from the cannabis fumes, was about to drop...
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