There are many causes of dizziness and nausea after smoking, which are generally caused by the stimulation of the central nervous system of the brain by nicotine and nicotine in cigarettes, including nicotine poisoning, hypoxia, allergic reactions, etc. 1, nicotine poisoning: due to excessive smoking leads to nicotine poisoning, dizziness, nausea and other symptoms, and in severe cases can lead to sudden death; 2, hypoxia: smoking can lead to a large amount of carbon monoxide being inhaled, causing brain Brain hypoxia, dizziness, nausea symptoms; 3, allergic reactions: some people may be allergic to the nicotine and tobacco tar and other components contained in cigarettes, dizziness, nausea, redness and other symptoms; 4, too excited: smoking when people are prone to enter a hyperactive, irritable state of mind, causing the scalp nerves, vasodilation and cause patients dizziness, nausea; 5, other: smoking may cause cerebrovascular transient spasm, causing transient cerebral hypoperfusion. cause transient cerebral blood supply deficiency, resulting in headache, dizziness, nausea. Because of the great impact of smoking on people’s physical and mental health and the environment, it is important to quit smoking in a timely manner. This can be done by strengthening the will, replacing habits, diverting attention, self-rewarding, and medication-assisted methods, making a detailed plan to quit smoking, gradually reducing the number and frequency of cigarettes, and replacing them with something like melon seeds or candy when you want to smoke.