Smoker’s disease is a low incidence cerebrovascular disease that refers to a narrowing or occlusion of the major arteries of the brain, followed by a network of small vessels with abnormal side branches. As a rare disease, it is still not detected and treated as soon as possible in some local hospitals due to lack of information or hospital staff capacity. What does it mean to detect ischemic foci in smog by angiography? A cerebral angiogram is the primary means of diagnosing smog. The diagnosis of smog is usually confirmed by the presence of a narrow network of tiny vessels at the base of the skull that appear to be smoky. Ischemic smog is the most common type of smog. The narrowing or occlusion of blood vessels causes ischemia in the brain parenchyma, resulting in ischemic foci, which can cause symptoms. There is no pattern to the attacks of smoker’s disease, and patients need to be treated as soon as possible after diagnosis. In the treatment of smog, it is important to recognize as soon as possible that conservative treatment is not practical for smog and that surgical treatment is the best way to get patients out of danger. At present, it has been proven in a large number of clinical practices that combined vascular bypass is better than single bypass and patching, which can rebuild the blood flow side channels and effectively prevent cerebral infarction or cerebral hemorrhage.