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ng a process known as ôprecipitated withdrawalö to block the chemical receptors in rat brains the scientists found the animalsÆ brains abruptly stopped the action of the drug, (Carpenter 2001, 41). Withdrawal effects subsided when brain receptors were blocked, leading scientists to conclude that long-term use of marijuana ôcan lead to dependence,ö (Carpenter 2001, 41). In April of the same year, scientists reported a new method

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