CO does not smell. But gas does.
My "story" never changed. At first I suspected mold, or the great abundance of dust, spores, and bacteria in the environment, because of the symptoms I would experience upon remaining in your place for longer than an hour or two. I didn't suspect CO at first, simply because you had not died from it yet.
Then I realized, well yeah but you *are* dyING.
Glad my nagging finally paid off. Maybe next time you won't drag me so much through the ringer. lololol