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The research, published in the British Medical Journal, highlighted a 44 percent increase in risk of cognitive impairment when exposed to high levels of second-hand smoke.

Previous studies identified active smoking as a risk factor for cognitive impairment and dementia.

However, this is the first large-scale study to conclude that second-hand smoke exposure could lead to dementia and other neurological problems in adults. (Previous findings suggested that second-hand smoke exposure could impair cognitive development in children and adolescents.)

The research, led by Dr. David Llewellyn, used saliva samples from nearly 5000 non-smoking adults over the age of 50. By measuring levels of cotinine (a byproduct of nicotine) in their saliva and taking a detailed smoking history, the researchers were able to assess levels of exposure to second-hand smoke. Check /hopesgate.net/

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Q: Explain why smoking may cause mental impairment?
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