What is the most common cause of lung cancer in people who never smoked?

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Exposure to the Radon gas.

The most common cause of the lung cancer in an individual who is a non-smokers is the actual exposure to the radon gas,

also according to the agency which is the " US Environmental Protection Agency (EPA)", Exposure to the radon gas also actually accounts for about the twenty-one thousands deaths which actually occured from the lung cancer each year. .it was also stated that About the 2,800 of these deaths actually occured among the indivduals who have never smoked....