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Passive smoking increases risk of severe dementia, according to study in China
Date:1/9/2013

Passive smoking, also known as 'second-hand' smoke or environmental tobacco smoke (ETS), is known to cause serious cardiovascular and respiratory diseases, including coronary heart disease and lung cancer. However, until now it has been uncertain whether ETS increases the risk of dementia, mainly due to lack of research. Previous studies have shown an association between ETS and cognitive impairment, but this is the first to find a significant link with dementia syndromes.

The study, published in Occupational and Environmental Medicine, is a collaboration between scientists at King's College London and Anhui Medical University, China, along with colleagues in the UK and USA.

According to the World Health Organization (WHO), nearly 80 percent of the more than one billion smokers worldwide live in low- and middle-income countries, where the burden of tobacco-related illness and death is heaviest; but only 11 percent of the world's population are protected by comprehensive smoke-free laws.

China is the largest consumer of tobacco in the world, with 350 million smokers. Since 2006, the Chinese government has actively promoted the introduction of smoke-free environments in hospitals, schools, on public transport and in other public places, but implementation has not been widespread.

Recent data show that the prevalence of passive smoking is still high, with over 50 percent of people exposed to environmental tobacco smoke on a daily basis. China also has the highest number of dementia sufferers in the world, with increasing rates of new cases as the population ages.

Dr Ruoling Chen, senior lecturer in public health from King's College London, and colleagues interviewed 5,921 people aged over 60 in the rural and urban communities of Anhui, Guangdong, Heilongjiang, Shanghai and Shanxi to characterise their levels of ETS exposure, smoking habits and assess levels of dementia syndromes.

They found that 10 p
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Contact: Katherine Barnes
katherine.barnes@kcl.ac.uk
44-207-848-3076
King's College London
Source:Eurekalert

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