An early report that was conducted by British physicians claimed that they had found irreversible brain damage in ten male marijuana users -- all of whom had been referred to them for medical treatment because of psychiatric illness, neurological symptoms, or drug abuse problems (Zimmer & Morgan 1997). These researchers used a brain imaging technology and forced air into the patients' brains through the spinal column, then reporting that they saw "abnormalities consistent with cerebral atrophy -- actual brain tissue shrinkage" (1997). The researchers methods were criticized and it was concluded within just a few short years that the brain imaging technique that they use was medically "risky and unreliable" (1997). Using more modern brain imaging technologies today, researchers have not found any evidence of brain damage in human marijuana users, even in those humans who smoke an average of nine marijuana cigarettes a day (1997).

Today there is the...
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