I would at least spend some time taking a detailed history looking for any suggestion of past history of head trauma. and on exam look for any signs of brain lesions or encephalitis.
Just sayin'.
Link: https://rarediseases.org/rare-diseases/kluver-bucy-syndrome/
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long term marijuana use most certainly has negative psychological and health consequences. It would stand to reason that earlier use would result in gretaer risk to the formative brain and psyche.