Dizziness after smoking may be due to harmful gas poisoning, lack of oxygen to brain cells, or acute cerebral vasoconstriction and acute coronary artery spasm. 1. Smoking will inhale excessive nicotine and tar components. If you smoke in a space with poor air circulation and inhale excessive second-hand smoke, it may cause harmful gas poisoning such as nicotine and tar, resulting in dizziness. At this point, you need to immediately keep the air clear and inhale fresh air to relieve the symptoms. 2. Smoking can lead to a prolonged lack of oxygen to the brain cells, and the lack of oxygen supply can further deepen the gas poisoning and aggravate the dizziness. 3. Smoking may also appear after acute cerebral vasoconstriction and acute coronary artery spasm, too much smoking leads to aorta and capillary blood supply, causing spasm, further aggravate dizziness. Long-term smoking is very harmful to the body, it is recommended to try to quit smoking. If the dizziness after smoking can not be relieved, it is recommended to go to the hospital in a timely manner, timely treatment to alleviate the symptoms.