Smoking has a significant excitatory effect, which can stimulate the brain and easily cause sleep disorders in patients. Because the main component of cigarette is nicotine, nicotine has obvious vasodilating effect, and when the blood vessels are excessively dilated, it may cause insufficient blood supply to the brain. Insufficient blood supply to the brain can cause patients to experience blackness in front of the eyes, as well as sensory impairment and motor impairment in the limbs. Insufficient blood supply to the cerebral stem of the cerebellum can cause dizziness, balance disorders and ataxia. In addition, long-term smoking can easily cause cerebral infarction. Smoking is an independent risk factor for cerebral infarction, and if a cerebral infarction occurs, patients can present with a variety of different signs and symptoms, depending mainly on the blood vessels involved in the lesion. If the cerebral infarction is severe there may be disturbances in consciousness, including drowsiness, somnolence and coma, but also confusion, delirium, other cerebral cortical states and vegetative states. In the case of cerebral stem infarction in the cerebellum, bulbar palsy and tetraplegia may occur in severe cases.