system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do lungs clean themselves out?

Besides coughing and sneezing, which I understand *outside* of the lugs. So like, what exactly is happening when a smoker quits smoking and lungs get to work expelling gunk?
gpt
Your lungs are always "expelling gunk" by using a massive network of what look like little tiny hairs capable  of movement. These hair like cells are called cilia and they slowly move anything that shouldn't be In the lungs out.  Most of what's moved out ends up going down into your stomach  as you swallow. But some get coughed up.