Caffeine-induced psychosis
Caffeine-induced psychosis is a relatively rare phenomenon characterized by psychotic symptoms such as delusions, paranoia, and hallucinations, and which can occur in otherwise healthy people. Overuse of caffeine may also worsen psychosis in people suffering from schizophrenia. This can happen with ingestion of high doses of caffeine, or when caffeine is chronically abused. However, there is a limited amount of evidence that confirms this.
Source: Wikipedia
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