An editorial in Thorax reviews the evidence for an association between mental illness, benzodiazepine use, and pneumonia. The authors find an equally augmented rate of pneumonia among schizophrenia, bipolar disorder, depression and phobic anxiety disorders, and a 95% greater risk associated with recent benzodiazepine use.
Quint, J., Brown, J. Weighing Up Risk Factors for Pneumonia: the Role of Mental Illness and Benzodiazepine Use. Thorax. Online December 18, 2012