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The common diabetes drug metformin may hold promise as a way to keep smokers from developing lung cancer, U.S. researchers said on Wednesday.
They said metformin prevented lung tumor growth in mice exposed to a cancer-causing agent found in tobacco smoke, and because it is already widely used in people, it may be worth further study.
Metformin has been shown to switch on an enzyme that blocks mTOR -- a protein that helps tobacco-induced lung tumors grow.