Lung cancer is associated with genetic factors, but this is only one of the causes of lung cancer. Lung cancer is not necessarily inherited, so people with a family history of lung cancer will not necessarily develop cancer. However, if a close relative has lung cancer, the chance of developing lung cancer is higher than that of a normal family group. It is an incorrect theory that some lung cancer patients have a family history of tumor, coupled with the fact that other family members have a significantly higher chance of getting lung cancer, and thus would assume that the disease is caused by heredity. Only a few lung cancer patients are clinically identified as having family genetic factors, but there is no clear medical conclusion that genetic genes will definitely cause lung cancer, so people with family history of lung cancer do not need to worry too much and will not necessarily develop lung cancer. Therefore, people with family history of lung cancer do not have to worry too much and are not necessarily susceptible to lung cancer. Compared with genetic factors, acquired factors are the most important causes of lung cancer. Therefore, people with family history of lung cancer should develop good living habits, go to hospitals regularly for standardized checkups, and detect and solve problems as early as possible through CT scans and other examinations. They should also quit smoking and drinking, wear masks when they go out and avoid places with serious environmental pollution to help reduce the chance of lung cancer.