the lungs are so susceptible to infection because it is a moist, dark place that is exposed to the outside air.
i think my lungs were filled with candida long ago and that my success with getting my lungs back was a result of killing that fungus. oral H2O2 did the trick for me. then i got busy drinking tons of colloidal silver and killed off the rest of the bloom. it did start to come back but getting my amalgams out has allowed me to get it under control.