Exposure to asbestos for more than 5 years is likely to cause cancer, especially if you do not pay attention to protection when exposed to asbestos, you are more likely to develop lung cancer. Exposure to asbestos can also lead to pneumoconiosis. Patients with pneumoconiosis will suffer from respiratory dysfunction, coughing and sputum, and nodules will form in the lungs, which are more likely to become cancerous after a long period of time. Therefore, workers who work with dust and smokers are more prone to cancer. These are high-risk groups who should routinely undergo chest CT examinations after the age of 45 to screen for early lung cancer and facilitate early treatment.