I have heard of people getting LC who never smoked. There has to be some other reason for it.
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Non-smokers have about a 3% chance of getting it. Smokers have about a 6% chance.
Asbestos fibers, radon gas, familial predisposition and some cases chronic lung diseases like COPD (with or without a history of smoking) are also risk factors for lung cancer. For some reason the rate of women who get lung cancer but who had never been smokers or lived with smokers is on the increase.
Dana Reeve the widow of Christopher Reeve was one; never was a smoker and died at age 44, less than 2 years after her husband’s death.