Mucus is just a fancy word for snot. While snot is usually associated with noses and sinuses, it’s found in the mouth, throat, lungs, and gastrointestinal tract. There’s more mucus present when you have a cold, but it’s always there; your body produces up to 2 liters of the stuff on a daily basis. And for good reason. Mucus is a lubricant. Without it, your mouth, nose, throat, and organs would dry out. You know how awful it is when your throat and nose feel dry? Thank mucus for helping you not feel like that all the time. Mucus also catches dust, pollen, dirt, or whatever else gets into your body through breathing. Mucus keeps these foreign substances from irritating the lungs and other organs. Hooray for mucus!