In a perspective of personalized care for smoking cessation, a better clinical characterization of smokers with schizophrenia (SZ) is needed. The objective of this study was to determine the clinical characteristics of SZ smokers with severe nicotine (NIC) dependence.

Two hundred and forty stabilized community-dwelling SZ smokers (mean age = 31.9 years, 80.4% male gender) were consecutively included in the network of the FondaMental Expert Centers for schizophrenia and assessed with validated scales. Severe NIC dependence was defined by a Fagerstrom questionnaire score ≥7. Major depression was defined by a Calgary score ≥6. Childhood trauma was self-reported by the Childhood Trauma Questionnaire score (CTQ). Ongoing psychotropic treatment was recorded.

Severe NIC dependence was identified in 83 subjects (34.6%), major depression in 60 (26.3%). 44 (22.3%) subjects were treated by antidepressants. In a multivariate model, severe NIC dependence remained associated with major depression (OR = 3.155, P = 0.006), male gender (OR = 4.479, P = 0.009) and more slightly with childhood trauma (OR = 1.032, P = 0.044), independently of socio-demographic characteristics, psychotic symptoms severity, psychotropic treatments and alcohol disorder.

NIC dependence was independently and strongly associated with respectively major depression and male gender in schizophrenia, and only slightly with history of childhood trauma. Based on these results, the care of both nicotine dependence and depression should be evaluated for an effective smoking cessation intervention in schizophrenia. Bupropion, an antidepressant that has been found as the potential most effective strategy for tobacco cessation in schizophrenia to date, may be particularly relevant in male SZ smokers with comorbid major depression.

The authors have not supplied their declaration of competing interest.