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What's the problem with smoking?
The biggest immediate impact we could make on cancer would be to stop people smoking. Smoking causes more than a quarter of all deaths from cancer. Cigarette smoke contains 3000 different chemicals, some of which are carcinogens. Some people have a lower risk of developing lung cancer. Their cells may be more efficient at repairing the gene damage caused by the carcinogens.
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Smoking causes a third of all cases of cancer.
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