Lu, 30 years old, woke up in the morning with a sudden headache, unable to speak and then coma. He was admitted to the hospital for CT examination: cerebral hemorrhage broke into the ventricle. After emergency whole brain angiography, he was diagnosed with “smoker’s disease”. After aggressive treatment, the patient is now at peace without any sequelae. Although “smog” is an ischemic cerebrovascular disease, the symptoms vary greatly at different ages and are easily missed and misdiagnosed clinically. The disease is called “smog” because it looks like smoke on cerebral angiography. The disease occurs in two groups of people: young adults aged 30-40 years old and children under 10 years old. The former accounts for about 60% of the population, with slightly more men than women, and the incidence rate is 1.2:1. However, this figure is different from the situation in foreign countries, where the incidence rate of children is higher than that of adults, and there is a tendency for the number of “smog” to increase in recent years. Early diagnosis and treatment is the key to early detection, and most patients are able to return to normal life.