Turn back time: how quitting smoking reverses lung cell damage

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Smokers can effectively turn back time in their lungs by kicking the habit, with healthy cells emerging to replace some of their tobacco-damaged and cancer-prone ones, a new study shows.

Smokers have long been told their risk of developing diseases like lung cancer will fall if they can quit, and stopping smoking prevents new damage to the body.

"People who have smoked heavily for 30, 40 or more years often say to me that it's too late to stop smoking -- the damage is already done," he said in a statement issued by the institute.Some of the people in the study had smoked more than 15,000 packs of cigarettes in their life, he said. But a mutation in the wrong gene in the wrong cell can "dramatically change the behaviour of the cells and instruct them to behave more like a cancer", Campbell told AFP.The study found nine out of every 10 lung cells in current smokers had mutations, including those that can cause cancer.

"Once the person quits smoking, the cells gradually proliferate from this safe harbour to replace the damaged cells," Campbell told AFP.

 

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