It’s never too late to stop smoking in terms of survival from lung cancer.
Researchers in Canada studied more than 35 thousand patients with lung cancer.
They found that ex-smokers who quit more than five years before being diagnosed were 20% less likely to die than current smokers.
But even those who stopped the habit only two years earlier had a 12% lower risk of death.
Long-term heavy smokers are also more likely to survive if they stop before developing lung cancer.
The study was led by researchers in Canada and presented at a meeting of the American Society of Clinical Oncology.
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