Most of us probably do not know much about smog because it is a relatively rare disease. Slowly said is the general public, is a lot of primary health care workers may not be clear. Smoke disease was actually first discovered and named by a Japanese scholar in the 1950s. This Japanese medical expert found that the main branches of the cerebral artery ring were occluded bilaterally, and the skull base was proliferated with a network of small, fragile blood vessels, which appeared as a smoke-like vascular shadow when doing cerebral angiography, so it was imaginatively called smoky disease. After summarizing and analyzing many cases, he found that the main arteries of the brain are either narrowed or occluded; they can be the end of the internal carotid artery, the anterior or middle cerebral artery, or sometimes even the beginning of the posterior cerebral artery; some patients have bilateral lesions, while some patients may have unilateral lesions. Some patients ask what to do about occlusion of the left middle cerebral artery in smog. Indeed, a common clinical manifestation of smoker’s disease is narrowing or occlusion of the middle cerebral artery, which subsequently leads to an abnormal vascular network at the base of the skull. This cerebrovascular lesion may occur on the left side of the brain, on the right side of the brain, or both sides. Whether unilateral or bilateral, smog should be treated aggressively. A more effective treatment for smog is combined vascular bypass surgery, which can achieve very good clinical results. Generally for this middle cerebral artery occlusion, direct bypass surgery with superficial temporal artery-middle cerebral artery bypass is performed, followed by simultaneous multifactorial patching to induce the formation of neovascularization in a larger area and expand the surgical effect.