Children are particularly at risk of the effects of passive smoking in their own homes The first global study into the effects of passive smoking has found it causes 600,000 deaths every year.
One-third of those killed are children, often exposed to smoke at home, the World Health Organization (WHO) found.
The study, in 192 countries, found that passive smoking is particularly dangerous for children, said to be at higher risk of sudden infant death syndrome, pneumonia and asthma.
Passive smoking causes heart disease, respiratory illness and lung cancer.
"This helps us understand the real toll of tobacco," said Armando Peruga, of the WHO's Tobacco-Free Initiative, who led the study.
'Deadly combination'
The global health body said it was particularly concerned about the 165,000 children who die of smoke-related respiratory infections, mostly in South East Asia and in Africa.
It said that this group was more exposed to passive smoking than any other group, principally in their own homes.
"The mix of infectious diseases and second-hand smoke is a deadly combination," Mr Peruga said.
As well as being at increased risk of a series of respiratory conditions, the lungs of children who breathe in passive smoke may also develop more slowly than children who grow up in smoke-free homes.
Worldwide, 40% of children, 33% of non-smoking men and 35% non-smoking women were exposed to second-hand smoke in 2004, researchers found.
This exposure was estimated to have caused 379,000 deaths from heart disease, 165,000 from lower respiratory infections, 36,900 from asthma and 21,400 from lung cancer.
According to the study, the highest numbers of people exposed to second-hand smoke are in Europe and Asia and the lowest rates of exposure were in the Americas, the Eastern Mediterranean and Africa.
The research also revealed that passive smoking had a large impact on women, killing about 281,000 worldwide. This is due to the fact that in many parts of the world, the study suggests, women are at least 50% more likely to be exposed to second-hand smoke than men.
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Source: http://www.bbc.co.uk/go/rss/int/news/-/news/health-11844169
Nathanial Maccord Kristeen Tannery Rosario Kozee Delila Hasley
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