Nausea and vomiting when smelling smoke may be related to pregnancy, chronic pharyngitis, chronic gastritis and other reasons. 1. Pregnancy: some pregnant women in early pregnancy may have a strong early pregnancy reaction, especially sensitive to various odors, in the smell of fumes, nausea, vomiting phenomenon. 2. Chronic pharyngitis: chronic pharyngitis patients with sensitive throat parts, in the smell of smoke will produce stimulation of the mucous membrane of the throat, and then manifested as nausea, vomiting, may also be accompanied by coughing, coughing and other symptoms. 3. Chronic gastritis: because the stomach has a chronic inflammatory response, can have an impact on the peristaltic function of the stomach, resulting in patients with fat substances are difficult to digest, resulting in the gastrointestinal tract is easy to accumulate fatty foods, may be in the smell of fumes, nausea, vomiting and other symptoms. There are many other causes of nausea and vomiting when smelling smoke, after excluding pregnancy factors, it is recommended that patients should go to the regular hospital in time, clear causes, under the guidance of the doctor for targeted treatment.