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Around one in a hundred deaths worldwide is due to(由于) passive smoking ，which kills an estimated(估计) 600000 people a year, World Health Organization(WTO) researchers said on Sunday.

In the first study to access(评估) 他和global impact（影响）second-hand smoke ，WHO experts found that children are more heavily exposed(暴露) to second-hand smoke than any other age group, and around 165,000 of them a year die because of it.

"Two-thirds of the deaths occur in Africa and South Asia," the researchers, led by Annette Prus-Ustun of the WTO in Geneva, wrote in their study.

Children's exposure to second-hand smoke is most likely to happen at home, and the double blow of infectious(感染) diseases and tobacco "seems to be a deadly combination for children in these regions", they said.

Comments(评论) on the findings in the Lancet journal, University of Southern Californiaa said policymakers try to motivate(激励) families to stop smoking in the home.

"In some countries, smoke-free homes are becoming the nor, but far from universally," they wrote.

The WTO researchers looked at data from 192 countries for their study. To get sufficient(足够) data from all 192, they had to go back to 2004. They used mathematical modeling to estimate deaths. Worldwide, 40 percent of children, 33 percent of non-smoking men and 35 percent non-smoking women exposed to second-hand smoke in 2004, they found.

This exposure was estimated to have caused 379,000 deaths from heart disease, 165,000 from lower respiratory(呼吸道), infections 36,900 from asthma(哮喘) and 21,400 from lung cancer.