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Study finds genetic link to lung cancer 

Lung cancer appears to run in families, researchers said Tuesday, though exposure to tobacco smoke is still the dominant cause of the disease even for those who may be genetically predisposed.

The strongest family link was found in the relatives of patients who developed the disease at age 60 or younger. The parents of such people had nearly a three-and-a-half times higher risk of also developing the disease compared to the general population, the study said.

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