Marijuana is harmless. “Long-term use of marijuana produces changes in the brain similar to those seen after long-term use of cocaine, heroin, and alcohol. damages and destroys nerve cells and causes other pathological changes in the hippocampus (the major component of the brain's limbic system that is crucial for learning, memory, and the integration of sensory experiences with emotions and motivation) researchers have discovered that learned behaviors, which depend on the hippocampus, also deteri

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