Many patients with smog, a rare cerebrovascular disease, are concerned about passing it on to their children. Is smog hereditary? The heritability of smog is about 10%. That is, it does not mean that if there is a smoky patient in the family, his children must have the disease. There is one child in our ward who is 4 years old and has had a combined bypass surgery for smog. What are the symptoms of this child? When he cries, he cries hard, causing hypoxia, and suddenly his arms and legs are not so good. As a result, his grandmother said she also had this disease. So her grandmother went to the examination, also smoke disease. The probability of this is 10%, not that it is inherited by everyone in the family, about 10%.