Low prevalence of smoking among patients with obsessive-compulsive disorder.

Tobacco smoking is common among psychiatric patients, especially among those with schizophrenia, where the prevalence is extremely high, 74% to 88%, compared with 45% to 70% in patients with other psychiatric diagnoses. Patients with anxiety disorders are less well investigated in this respect, particularly obsessive-compulsive disorder (OCD) patients. Eighty-three psychiatric outpatients with OCD and 110 members of the Swedish OCD Association responded to questions concerning their smoking habits. Among OCD patients, 14% were current smokers (compared with 25% in the general population of Sweden), 72% had never smoked, and 11 previous smokers had stopped, mostly without any difficulties. Since a decreased smoking rate among OCD subjects was confirmed, the smoking prevalences in schizophrenia and OCD, respectively, seem to represent either end of a continuum, and OCD may also differ significantly from other anxiety disorders in this respect. Possible implications of this finding for the purported frontal lobe dysregulation in OCD are discussed.