There are many medical conditions that people are unfamiliar with or have never heard of, including smog, which is relatively rare. Because of the lack of understanding of smog, many people can only interpret it in a literal sense. However, smog is a type of cerebrovascular disease that has far-reaching effects and can be disabling and fatal, so patients should not be careless. How is smog caused? Smoker’s disease is caused by chronic progressive stenosis or occlusion of the major branches of the cerebral arterial ring, resulting in abnormal growth of the vascular network at the base of the skull. When a cerebral angiogram is performed, it shows many dense, tiny blood vessel shadows that resemble smoke, hence the name smoker’s disease. The cause of smog is not clear yet, but some scholars say that there is a certain relationship between smog and heredity, but the probability of heredity is not high. There is also a possible association between the occurrence of smog and a number of diseases, such as meningitis, intracranial infections, leptospirosis, brain aneurysms and age-related atherosclerosis, which may be involved in the development of this disease. Smog is very lethal, and there is no possibility of self-healing from smog, so it is important to go to the hospital for examination and treatment after the disease. There are generally conservative medication and surgical treatment, but the effect of medication is limited, and active surgical treatment is generally required to descend to obtain good results. Combined vascular bypass surgery is a very comprehensive treatment, making up for the shortcomings of traditional surgical methods, rapidly improving the blood supply to the brain while inducing the formation of neovascularization on a larger scale, achieving a more desirable therapeutic effect.