From a recent update posted on the Medscape Neurology section:

Researchers at the American Academy of Neurology 59th Annual Meeting presented preliminary results from a study showing that long term exposure to secondhand smoke alone increases your risk for dementia by about 30%.

If you’re interested in learning more about the potential mechansim by which cigarattes destroy your brain, click here to read this earlier post. 

Reference: American
Academy of Neurology 59th Annual Meeting: Abstract S01.005. April 28 – May
5, 2007.

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