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ameratsu said:

Is this the one kasz? link 

If it is, what you said above in point 2 is a little misleading. This study only indicates that very heavy (53-84 joints/week) have "persistent decision-making deficits and alterations in brain activity". They note in the abstract that brain activity and task performance between moderate users (8-35 joints/week) and the control group were "similar". 

They also point out that it is unclear if these decision-making problems shown in the heavy users continue after Marijuana use has stopped or if they might get worse with continued use.

Another study I found seems to indicate that while tasks performed on Marijuana take longer, decision-making accuracy is not impaired.

Of course, I don't have access to either study in full.


It is one of them, but not the only one. When talking about effects generally you talk about the worst. I mean, it's even done with those "addiction" charts. It's a lot harder to quit a joint a day then it is a beer or two a day. Hell in college and after that's basically what happened to most of my friends. They didn't have the money to spend on a both an 8th and a case beer... and they ended up going with the 8th when push came to shove.