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At the beginning of the fire, white smoke will be produced, when the surrounding oxygen is gradually consumed, it will start to produce black smoke.
In a short time, the temperature in the smoke and the concentration of the poison gas will rise rapidly, the environment will soon become a fatal danger to high temperature, it doesn't help people to cover their mouth and nose with a wet towel in such a environment, it's going to die soon.
Many cases of fire victims are excessive inhalation of the poison gas , and too low oxygen concentration in the blood to cause death,not to be burned by fire.