Over 8,000 people aged 30 to 60 were studied by UK and Danish researchers for 25 years in the Thorax study. Researchers found that at least 25% of the smokers without any initial symptoms of the disease had "clinically significant" COPD(smoke desease), while up to 40% had some signs of the condition. Over the 25 years, 2,900 people died.
Citation: http://news.bbc.co.uk/2/hi/health/6054892.stm
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Sidi-M-Elofir
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