When a patient is dizzy after smoking, the following causes are mainly considered: 1. Some components of the smoke are considered to cause dizziness, such as the high content of nicotine and tar in the smoke, which can cause stimulation of the central nervous system and easily lead to dizziness. 2. The patient will experience dizziness, mainly in patients with a weak constitution. 3. After smoking, some components of the cigarette will stimulate the cerebral blood vessels, causing the cerebral blood vessels to become cervical and causing the patient’s cerebral blood supply to be insufficient.