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Would you get well tonk lung capacity or would you develop a wasting diease from lack of oxygen?
Your lung capacity would increase
it's one of them singing exercises, you breathe in as much as you can, hold it, and then try and sip in little bits more
smoking also helps
isn't this pretty much how those divers who dive without any equipment can increase the length of the time they can spend under water?
...then held your breath? You can last for ages! I remember doing it at school during swimming and being amazed.
Probably not very safe, but whatevs.