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I've never been too convinced of the similarity between schizophrenia and entheogens. Main difference is the schizophrenic isn't aware his hallucinations arn't real. Also schizophrenia isn't generally considered a happy experience - whereas mushrooms invoke utter ecstasy.
People are tending to move away from the dopamine hypothesis of schizophrenia. Researchers are starting to look at glutamatergic mechanisms. Both the 5HT2A binding hallucniogens and the NMDA antagonist dissociative hallucinogens have effects on glutamate receptor activity. Also, NMDA antagonists are considered to be a better 'model psychosis' than the 5HT2A hallucinogens or amphetamine psychosis.