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I couldn't help but think of a drug user's eagerness to attach deeper meaning to seemingly unimportant events while under the effects of heightened dopamine levels.

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I think this ties in closely with the dopamine hypothesis of Schizophrenia and Amphetamine being the chemical model for said disease.

And drug use is thought to trigger schizophrenia in certain people: http://en.wikipedia.org/wiki/Schizophrenia#Substance_abuse

Only by a small portion of the psychiatric community. The vast majority believe that the causation runs the opposite direction, that it's self-medication. This has been discussed for years for just about every serious mental illness, in fact. There's no real consensus either way, but most mental health professionals I know agree with this.

(I grew up in a house of mental health professionals, so I've had no dearth of opinions on the matter, to say the least.)

Yet another problem that can be reduced to the chicken V egg dilemma.

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