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Second Hand Smoke and Dementia February 13, 2009 6:42 PM


Second-Hand Smoke Increases Risk of Dementia  http://www.newsmax.com/health/smoke_risk_dementia/2009/02/13/181611.html
Friday, February 13, 2009 9:43 AM

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Exposure to second-hand smoke boosts the risk of dementia and other cognitive problems, even among people who have never smoked, the largest study of its kind reported Friday.

Ill effects on non-smokers of constant exposure to tobacco smoke include an increased risk of lung cancer, diabetes, cardiovascular disease, stroke and death, earlier research has shown.

As for the impact on brain function, active smoking has been found to impair the mind but the evidence for passive smoking has until now been sketchy.

Using new methods in the largest clinical trial to date, a team led by Cambridge University professor David Llewellyn found that even people who had never smoked but kept constant company with smokers performed less well in cognitive tests.

The investigation focussed on nearly 5,000 adults over the age of 50 who were former smokers or who had never smoked.

The volunteers were divided into four groups according to their exposure to passive smoking.

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