When propylene glycol is inhaled, it should be removed from the environment immediately and those who are unwell should be taken to a doctor immediately for treatment. Propylene Glycol is a chemical substance, which is commonly used in industrial production, but it is hazardous and can cause some adverse effects on the human body. Under normal atmospheric conditions, propylene glycol can be converted from a liquid to a gas at 107 degrees Celsius. Propylene Glycol does not affect the human body under conditions of good natural ventilation, but can cause discomfort by inhalation in environments with poor natural ventilation and excessive buildup of propylene glycol gas. Inhalation of propylene glycol for a short period of time does not usually cause discomfort. However, prolonged inhalation of propylene glycol may cause stomach pain, nausea, vomiting or eye irritation. Patients who are found to have inhaled propylene glycol should be assisted to get out of the current environment and get some fresh air in a ventilated area. Patients with mild cases may gradually recover and return to normal. In case of prolonged inhalation of propylene glycol for a large amount of time, it is necessary to send the patient to the hospital in time and give him/her oxygen and other symptomatic treatments. For this kind of patients, it is necessary to pay close attention to the changes of the condition and send them to the hospital for treatment in time, so as to avoid delaying the condition.