Why does smoking burp? What's going on here?

Burping is a common symptom of digestive tract irritation. Why do people burp? It turns out that there is a diaphragm between the chest and abdominal cavity of the human body, which is composed of muscles. It not only separates the chest and abdomen, but also assists breathing. However, when this diaphragm contracts abnormally strongly, it will cause air to be suddenly sucked into the trachea, and with the closure of the sound band, it will make a burping sound. Under what circumstances will the diaphragm shrink strongly? Eating too fast, eating cold food or eating too much and too full will stimulate the phrenic nerve or vagus nerve, which will cause the diaphragm to contract abnormally strongly through a series of nerve reflexes, thus causing hiccups. So as long as you are careful not to eat too fast, too full and cold food, I believe it will not cause hiccups so easily! If hiccups occur, I have tried the method taught by the primary school teacher before. The first time you burp, the second time you burp, pinch your thumb, forefinger and middle finger tightly together, and most of the problems will be solved! But sometimes I can't! Ha ha! How amazing!