There is no such thing as an auto-digestive trachea because there are no digestive enzymes in the trachea.
Usually the entry of a foreign body into the trachea is capable of triggering a cough reflex, which is a defensive mechanism to cough the foreign body out of the lungs. However, there are a small number of people who have a foreign body in the lung tissue, but with the subsequent swinging of the lung cilia, from the respiratory tract, the probability of the occurrence of obstructive pneumonia and other conditions of the population is extremely low.
In addition, it is worth noting that if the patient choking on rice particles to the trachea after the emergence of more serious symptoms, or symptoms continue to fail to improve, should promptly go to the hospital for treatment, so as not to cause delay in the disease.