Smoking and schizophrenia.

Several studies have shown that patients with schizophrenia have an extremely high prevalence of smoking, almost 90%, compared to only 33% in the general population and 45-70% in patients with other psychiatric diagnoses. The reasons for the high prevalence of smoking among schizophrenics is unknown, but it is likely that smoking behavior in schizophrenia may be a complex process, related to numerous interrelationships between the psychopathological, biochemical, and neuropharmacological aspects of smoking and of schizophrenia.