As you go through puberty, you slowly begin to discover that you are immune to pressure and temperature changes and extremes. Your body can also process anything you take into your lungs is similar ways to oxygen. In other words, you can breathe virtually anything - poisonous gases, water, etc - as long as you can take it into your lungs. What do you decide to do with your life having these abilities?
would make an interesting story I think...especially considering the wide variety of options that combination of abilities can give to a person.