Nausea and vomiting after smoking, the most common factors are as follows: First, if a large number of short-term inhalation of nicotine and tar components, can lead to smoke intoxication, also known as drunkenness. This is due to the rapid entry of nicotine and tar components into the bloodstream and lead to adverse gas poisoning. Second, a large number of smoking can also lead to a transient lack of oxygen in the brain, when the brain cell oxygenation is insufficient, the body’s carbon dioxide partial pressure is too high, the partial pressure of oxygen is too low, the oxygen saturation of the blood suddenly decreased and triggered by nausea, reflex vomiting. Third, after smoking, such as nausea, want to vomit, but also because of nicotine and tar components quickly absorbed into the blood, stimulate the gastric mucosa leading to gastric mucosa secretion of gastric acid, triggering nausea, want to vomit feeling. No matter what the cause, such as severe dizziness, nausea, vomiting, the urgent need to go to the hospital for treatment.