but on the other hand , the methamphetamines inhibited the secretion of adrenalin , and this , for some personalities , was vital ; schizophrenia had at last , like cancer , been unmasked ; cancer consisted of a virus and schizophrenia had turned out to be an overproduction of serotonin which the brain could not handle ; hence the hallucinations -- true hallucinations , although the dividing line between hallucination and authentic vision had become thin indeed .