Researchers in the U.K. find in a 22-year prospective study of 1134 men, 103 of whom took benzodiazepines regularly for one or more period of the study, that benzodiazepine use was associated with a more than tripled risk of dementia. This effect was observed even after adjustment for psychological distress and other covariables.
Abstract → Gallacher, J., Elwood, P., et. al; Benzodiazepine Use and Risk of Dementia: Evidence from the Caerphilly Prospective Study (CaPS). Journal of Epidemiology & Community Health, 2012; 66:869-893