Smoking is not recommended after a fracture, it will affect the progress of fracture healing, and it is harmful. Tobacco contains nicotine, which has an effect on blood vessels, causing vasoconstriction at the fracture site and slowing down the formation of capillaries at the fracture site. The above effects will lead to a significant reduction in blood supply to the fracture site, resulting in delayed healing or non-healing of the fracture. It is recommended to refrain from smoking during the early stages of fracture healing, especially during the first 6 weeks. If the fracture is in the rib cage, smoking is even less recommended. The loss of rib integrity after a fracture, the tendency for the broken ends of the fracture to move apart, and the misalignment that occurs when breathing can be painful. Smoking irritates the airway and produces coughing, and the pain at the fracture site is aggravated. And after smoking, the irritation of the airway is easy to produce inflammation, and the poor respiratory function after rib fracture, resulting in secretions and phlegm in the airway or in the lungs, which are difficult to expel, may further induce infection in the lungs, resulting in pneumonia. Smoking is not beneficial to the body, and will also delay the speed of fracture healing, so it is not advisable to smoke after a fracture. Patients with fractures are advised to go to the hospital for treatment in time.