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 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.
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