Lung cancer: the top of the list for both men and women. Why are the lungs so vulnerable? In terms of the current analysis of cancer-causing causes, there are two main points, the first is smoking. According to statistics, 30% of tumor incidence is related to long-term smoking, among which the most closely related is lung cancer. In addition, because carcinogenic substances can be absorbed by the lungs and cause systemic harm, it can induce laryngeal cancer, esophageal cancer, oral cancer, bladder cancer, kidney cancer, pancreatic cancer and so on. The second is environmental pollution. Relevant data show that air pollution is one of the causes of lung cancer. Environmental pollution is no less harmful to people’s lungs than smoking.