When in use, a certain amount of water is first added to it, the cigarette is inserted into the middle cigarette holder, and then the cigarette (gas state) passes through the water inside and then enters the lungs with its mouth pressed against the top nozzle. The advantage of this is that you can filter out some impurities with water. After using it for a period of time, you can see that the water inside has become turbid and needs to be replaced.

Because the gun barrel is usually held by both hands when it is used, there is also a small riddle about it: hands around, mouth to mouth O(∩_∩)O~