Smog is a relatively rare cerebrovascular disease with a very low incidence, and the total number of patients in the country is only in the 100,000 level. Because of its rarity, most people do not know much about it, and many primary care providers know very little about it. Today we will introduce this rare disease. Smoker’s disease was first discovered by a Japanese scholar in the 1950s and is prevalent mainly in Asia. It is mainly due to chronic progressive stenosis or occlusion of major bilateral branches of the cerebral arterial ring, resulting in impaired blood supply to the brain. In order to relieve this inadequate blood supply, the vascular network at the base of the skull compensates for the expansion and proliferation, resulting in an abnormal, malformed network of small smoky vessels. The walls of these smoky vessels are so thin and fragile that they can rupture at any time, leading to cerebral hemorrhage. Therefore, smog is mainly divided into ischemic smog and hemorrhagic smog. So what are the characteristics of ischemic smog? Ischemic smog often starts with headache, dizziness, nausea and vomiting, and some patients may have different degrees of consciousness impairment, and may show different degrees of diminished intelligence, sensory loss, dysphonia, aphasia, migraine, headache and brain nerve damage. Whether it is ischemic smog or hemorrhagic smog, it is very dangerous and may even cause disability and death in severe cases, so patients with smog should be seen in time and receive surgical treatment. Currently, combined vascular bypass surgery is an effective treatment for smog, which is a compound surgery that combines direct vascular bypass and patching, and is done together in the same surgery, which can establish a perfect blood supply side branch pathway, greatly improve the brain blood supply and cure smog.