Smoking can permanently alter the activity of genes and have irreversible effects on DNA that may be linked to cancer, research has shown. The findings may help to explain why some former smokers contract lung cancer long after they have quit.
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Lung cancer 'risk' for ex-smokers - BBC Health News 29th August 2007
Former smokers 'still at risk of cancer', research shows - Daily Mail 29th August 2007
Thursday, August 30, 2007
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