There are several risk factors that increase a person's risk of developing lung cancer, including smoking, secondhand smoke exposure, age, exposure to radon, asbestos, or other workplace carcinogens, the use of beta-carotene spplements in smokers, family history of lung cancer, diet, radiation therapy to the breast or chest, and air pollution. More information is available on these risk factors here: https://lungcancer.net/basics/risk-factors/ . There is a genetic component to the development of lung cancer, as the incidence of lung cancer is greater in those with a family history of the disease, with or without smoking or exposure to environmental carcinogens. One meta-analysis that leveraged data from 32 studies demonstrated a 2-fold increased risk for lung cancer in people with a family history of the disease, for both smokers and non-smokers.