Two substances excreted by the lungs?

ex·crete
ikˈskrēt/
verb
verb: excrete; 3rd person present: excretes; past tense: excreted; past participle: excreted; gerund or present participle: excreting

(of a living organism or cell) separate and expel as waste (a substance, especially a product of metabolism).
"excess bicarbonate is excreted by the kidney"
synonyms: expel, pass, void, discharge, eject, evacuate;
google.com

Lungs don't excrete, they respire. Respiration means an exchange of gases, oxygen in, CO2 and water vapor out.

It is rather important to know what the words mean. When the lungs start excreting something, you're gonna die.