When I first heard the name “smoker’s disease”, I was often mistaken for a disease caused by long-term smoking, but after some understanding, I realized that it is an occlusive cerebrovascular disease. It is a group of cerebrovascular diseases characterized by narrowing or occlusion of the irrigated segment of the internal carotid artery and the beginning of the anterior and middle cerebral arteries, followed by the appearance of a network of small vessels with abnormal side branches. It is named after the many dense piles of small blood vessel shadows that resemble the smoke exhaled during smoking when a brain angiogram is performed! With smog disease, some patients have seizures as their disease, some patients may have headaches, and some patients have different degrees of IQ loss due to brain ischemia. The more severe the degree of cerebral ischemia, the greater the effect on IQ. The infarct type causes acute stroke, which leads to permanent type of paralysis, aphasia, visual impairment and mental retardation. Therefore, when a diagnosis of smog is made, effective treatment should be taken as soon as possible. At present, smog can be treated clinically through surgery, and the surgical treatment for smog can be “combined vascular bypass surgery”. Combined vascular bypass surgery is a more effective treatment for smog, which is a compound surgery with the advantages of both direct and indirect bypass surgery, and can induce the formation of neovascularization in a larger area to improve the blood supply to the brain while rapidly restoring the local blood supply, so that the surgery can play a greater role.