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"The architects of marijuana prohibition have long maintained that tolerance to cannabis means the same thing as tolerance to addictive drugs like cocaine and heroin - that users need more and more to get high, driving them to crime and desperation. Now, the federal government's own research indicates that precisely the opposite is true. Science has finally caught on to what tokers have known all along: With marijuana tolerance, you have to smoke less to get high! High Times correspondent Jon Gettman explains the latest findings and how they discredit the government's drug policy...An alternative hypothesis about how dynamic tolerance to marijuana operates involves receptor "down-regulation," in which the body adjusts to chronic exposure to a drug by reducing the number of receptor sites available for binding. A 1993 paper published in Brain Research by Angelica Oviedo, John Glowa and Herkenham indicates that tolerance to cannabinoids results from receptor down-regulation. This, as we shall see, is good news. It means that marijuana tolerance is actually the brain's mechanism to maintain equilibrium. "