It can be diagnosed by DSA angiography, which examines the main branches of the cerebral artery ring bilaterally. If there is narrowing or occlusion, there is a network of small vessels with abnormal side branches, and the abnormal network of small vessels resembles smoke, hence the name “smog”. How long can a patient with smog live? Patients may have doubts about how long they can live with a disease they have never heard of before. The narrowing or occlusion of the cerebral blood vessels formed by smoky disease can cause insufficient blood supply to the brain and affect brain function, which may manifest as dizziness, headache, weakness of one side of the limb, etc. Severe cerebral ischemia may cause acute cerebral infarction and even threaten life, so we can’t help but consider the issue of life expectancy. Until now, the medical community has never stopped exploring the issue of how long a smog patient can live, and until there is irreversible dysfunction in our brain tissue, timely treatment of smog through surgery will not affect life expectancy.