Tobacco smoking stuns the cilia and then you start over time. They go from this pseudo-stratified or columnar-sylated or ciliated to more of what, like a stratified? Yeah. The reason for doing this is to clear the air. So it's just to get away and usually it will just throw it into your gastrointestinal tract, which then goes into your stomach and kills everything. But if it starts to be damaged and have all these chemicals coming in, it's going, oh, I need to protect myself. And so you lose that escalator. That's why you get the smokers cough. Like you wake up in the morton,