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Smoking Does Not Protect the Brain Against Dementia or Alzheimer's Disease

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-- Editor,

Smoking does not protect against dementia or Alzheimer's disease, according to a study in the British Medical Journal (BMJ), contradicting the implications of some earlier research.

Sir Richard Doll and colleagues from the Clinical Trial Service Unit and Epidemiological Studies Unit, Radcliffe Infirmary at Oxford reported on observations of over 34,000 male British doctors whose smoking habits have been reviewed every six to 12 years since 1951 to determine the impact on their health. The research team also reviewed the published data on the associations between smoking and Alzheimer's disease.

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