Dizziness from smoking is mostly caused by lack of oxygen to the brain and harmful substances inside the cigarette. 1, the composition of the cigarette contains nicotine, allergic to nicotine and poisoning will cause damage to the human brain, the patient will appear dizzy situation. 2, some people because of prolonged smoking, resulting in physical weakness, this time will also appear dizzy situation. And long-term smoking can lead to neurasthenia, which affects sleep and leads to dizziness. 3, when smoking, the smoke contains carbon monoxide, this time will cause the red blood cells to reduce oxygen delivery capacity, which leads to dizziness. 4, some people with poor lung function, heart, and trachea will also experience dizziness after smoking. So people with poor lung function, heart, and trachea must quit smoking. 5, smoking can sometimes cause the aggregation of platelets, resulting in increased viscosity of the blood, which can cause slow blood flow, resulting in insufficient blood supply to the brain and lack of oxygen to the brain, which can also lead to dizziness. 6, sometimes smoking can cause excitation of the cerebral cortex, resulting in dizziness caused by the expansion of the neurovascular in the scalp. Therefore, if there is dizziness after smoking, it is recommended to quit smoking immediately to avoid the impact on the body.