Anstey KJ, von SC, Salim A, O'Kearney R. Smoking as a risk
factor for dementia and cognitive decline: a meta-analysis of
prospective studies. Am J Epidemiol 2007 Aug 15;166(4):367-78.
Peters R, Poulter R, Warner J, Beckett N, Burch L, Bulpitt C.
Smoking, dementia and cognitive decline in the elderly, a
systematic review. BMC Geriatr 2008;8:36.
Williams JW, Plassmann BL, Burke J, Holsinger T, Benjamin S.
Preventing Alzheimer's disease and cognitive decline. Rockville,
MD: Agency for Healthcare Research and Quality; 2010. Report No.:
193.