Duke Zhou burned his tongue with a cigarette butt.

When the smoke reaches a certain length, that is, when you open your mouth, the smoke will stand up and not burn your mouth. Press the upper part of the cigarette butt with your tongue, so that the cigarette butt can be caught by your tongue and lower lip. Open your mouth, then the cigarette should stand up, push the cigarette butt in with your tongue, bite the cigarette butt with your teeth, and retract your tongue to avoid being burned until you practice more. The explanation is quite clear. I have worked hard, so I will give you some marks. I don't suggest trying with lit cigarettes, which will easily burn the upper jaw. Take care of yourself.