Most of those studies occurred over a time span of at least several years, and failed to account for the possible effects of other drug use (like acid or PCP). People who smoke pot are also more likely to do some of the other, harder drugs, and the trends seen in the study are quite possibly due to those harder drugs, rather than the weed itself.
I think most of these studies are done with an agenda (either for or against pot) and are necessarily biased.
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"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." - Winston Churchill
"All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act out their dream with open eyes, to make it possible." Seven Pillars of Wisdom, T.E. Lawrence
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