Dizziness from smoking is mostly due to lack of oxygen to the brain caused by prolonged smoking and the harmful components inside the smoke. 1. The carbon monoxide in the smoke causes a decrease in hemoglobin binding, resulting in insufficient blood supply, which causes dizziness when smoking. Smoking can sometimes lead to increased secretion of angiotensin, resulting in vasoconstriction, which can also cause cerebral artery spasm or insufficient blood supply to the brain, resulting in dizziness. 2, smoke contains nicotine, nicotine can cause stimulation of brain tissue, or due to allergies to the components contained in the smoke, these can lead to dizziness when smoking. Nicotine can affect blood pressure, make the heart beat faster, and sometimes even lead to heart arrhythmia and induce heart disease, which can lead to dizziness. Nicotine can also damage brain cells, and this time the smoker will experience central nervous system damage, which can cause dizziness. 3. People who smoke for a long time may develop arteriosclerosis, and patients may experience dizziness. In addition, people with pulmonary insufficiency may also experience dizziness after smoking. When you start smoking again after quitting for a period of time, you may also experience dizziness due to reduced adaptability to nicotine. Therefore, smoking is more harmful and it is recommended to quit smoking in order to reduce complications.