The claim that smoking can prevent novel coronavirus pneumonia is not supported by any evidence. Patients admitted to the hospital are often elderly, with underlying lung disease, a long history of smoking and lung disease, and may be sicker after infection with novel coronavirus. Therefore, smoking should not be used as an excuse for preventing novel coronavirus pneumonia, and there is no evidence to suggest that smoking can prevent novel coronavirus pneumonia. In terms of science, it is important to minimize smoking in order to reduce the risk of smoking-related diseases, including lung cancer. Source: Dr. Yurai