Nausea and vomiting after smoking may be caused by chronic pharyngitis, chronic gastroenteritis, sensitivity to smoke, nicotine saturation and other reasons. 1. Chronic pharyngitis: If you suffer from chronic pharyngitis, the nicotine in the smoke will have an irritating effect on the inflammation area, causing nausea and vomiting. 2. Chronic gastroenteritis: when smoking, the harmful substances within the smoke will stimulate the surface of the gastrointestinal mucosa, if you are suffering from chronic gastroenteritis at this time, the inflammation part is stimulated may also cause nausea and vomiting. 3. Sensitivity to smoke: If it is the first time you smoke, the first contact with smoke in the pharyngeal area of the body may cause some stimulation of the recurrent laryngeal nerve, thus leading to nausea and vomiting. 4. Nicotine saturation: If the patient smokes too much, resulting in high levels of nicotine in the blood, it may lead to toxic effects, thereby stimulating the brain to produce nausea and vomiting symptoms. If there is nausea and vomiting after smoking, it is recommended to go to the hospital in a timely manner to complete the appropriate examination and identify the cause before treatment. At the same time, it is also necessary to minimize the number of cigarettes, preferably quit smoking.