Answer:
Your bronchial tubes go to your lungs. When you swallow mucus it go to your stomach. While there is a shared path through your throat there is a flap that diverts so you will not inhale your soup when you swallow. Now, you can inhale moisture - say-so from spray painting or moist nouns and you can even suck down some food causing choking. Bronchitis is an inflammation of the tubes to/in the lungs and to be exact cause by microbes or virus - and those germs pass down your throat from a sinus infection that may or may not infect your lungs.

---