Dizziness after smoking is often referred to as tobacco intoxication, also known as drunk smoking. First, because of excessive nicotine and tar inhalation at one time, or passive inhalation of excessive secondhand smoke in a closed and narrow room, resulting in nicotine and tar poisoning and other harmful gases, the clinical symptoms of dizziness will arise, at which time it is necessary to inhale fresh air immediately to avoid low oxygen saturation of the brain cells due to lack of oxygen. Secondly, the high partial pressure of carbon dioxide caused by the lack of oxygen in brain cells for a long time will also further aggravate the vertigo and aggravate the low partial pressure of oxygen in the arteries, which will lead to insufficient oxygen supply and further deepen the gas poisoning. Third, smoking can also cause acute cerebral vasoconstriction and acute coronary vasoconstriction, when the large arteries and capillaries will cause spasm and insufficient blood supply due to excessive absorption of smoke, further aggravating dizziness.