It seems as though it's common to "tune out" or ignore an irritating sound, whether background noise or music. But can you do the same to an odor? Understand that when you work in an environment with a background odor, you often don't smell it after a while, but that is called "olfactory fatigue," in which your nose kind of wears out for that smell. Can you do that willfully? And if not, why not? Here's an article from Scary Symptoms that explores that situation.