Mold does NOT grow in your lungs. There is a type of mold that can cause what people refer to legionnaire's disease. This is very, very rare. If you had it, you would know, you wouldn't even be able to type to us. My husband had it and was so sick he couldn't even hold his head up and he had a very high fever. It comes on quite suddenly it's not a progressive thing at all. He woke up from a nap feeling a little off and a few hours later was begging me to take him to the ER.