Smoker’s disease is a cerebrovascular disease that was first discovered in Japan. It was first discovered and named by a Japanese medical specialist in the 1950s and 1960s. Smoker’s disease is primarily a chronic progressive narrowing or occlusion of the major arteries of the brain, secondary to the formation of an abnormal vascular network at the base of the skull. There are two main types of smoker’s disease: ischemic smoker’s disease and hemorrhagic smoker’s disease. In order to compensate for this poor blood supply, the penetrating arteries in the skull base of the brain will spontaneously undergo compensatory hyperplasia and form an abnormal skull base vascular network. When the rate of abnormal growth of the penetrating arteries at the base of the skull is insufficient to compensate for the lack of blood supply to the brain caused by the narrowing or occlusion of the main arteries of the brain, cerebral ischemia may occur, and even cerebral infarction may occur in severe cases. These abnormal vascular networks formed at the base of the skull are very fragile, with very thin walls. When blood pressure is unstable or in some other situations, these small vascular networks can easily rupture, which can cause cerebral hemorrhage, resulting in serious consequences, and sometimes even life-threatening, which are very dangerous. Therefore, once you develop smog, you should seek treatment promptly. Some patients say that doctors do not recommend surgery for ischemic smog. In fact, such advice may not be reasonable. In ischemic smog, some patients may not have very serious symptoms, only chronic ischemia, and will have some symptoms such as poor memory, mental discomfort, easy sleepiness and physical weakness, but later on, as the disease gradually develops, it is likely to cause more serious cerebral infarction or cerebral hemorrhage. The occurrence of cerebral infarction and cerebral hemorrhage is sometimes without precursory symptoms or warning signs, and may be sudden and cause serious consequences to the patient. Therefore, once a clear diagnosis of smog is made, it is advisable to have a preventive surgery early so as to greatly reduce the probability of future cerebral infarction or cerebral hemorrhage. Combined vascular bypass surgery for smog is a very advanced and effective treatment method, which is a two-pronged approach to re-establish sufficient and complete bypass blood supply channels for the patient’s brain through direct bypass + patching, thus greatly improving the patient’s brain blood supply and preventing cerebral infarction or cerebral hemorrhage, and achieving good treatment results.