How long it takes for symptoms to appear after gas poisoning is uncertain, and varies from person to person. Symptoms may be noticeable within a few minutes, or they may take longer.
Gas poisoning is mainly carbon monoxide poisoning, poisoning will appear symptoms time can not be determined, some minutes will have symptoms, some early symptoms are not obvious.
If you are in good health and exposed to low concentrations of gas in the air, it is a general gas poisoning, you may feel dizziness, nausea, vomiting and other uncomfortable symptoms after inhalation of gas, but your sanity is clear, if the gas poisoning is more serious, there may be drowsiness, coma, unconsciousness and other phenomena.
Gas poisoning requires immediate opening of windows and ventilation, detachment from the scene, and timely access to a hospital emergency department.
Gas poisoning try to do a good job of prevention, you should turn off the gas in time after use, usually keep the room well ventilated.