I have to take this literally, because I’ve been dying to take a stab at it. I have only smelled the inside of my nose and the lining of my nose baseline, without any other odors or scents around, smells like what I know to be “nothing.” Occasionally, what is nothing, smells like something, dependent upon what has been recently experienced by my upper lip. I have never smelled my outer nose, and presume it smells like most of the rest of me, presumably a forearm. I presume that if it smelled like an armpit, I might know by now. Yet, if I have smelled the armpit since I was born, would I notice it so much? I’m not sure, because babies have armpits, but they don’t smell like adults. :-\ But, all babies have a nose. I have smelled a baby’s nose, and it smelled like a forearm. But, I have been close enough to smell the nose of adults too, and I can confirm, on that basis, that a nose smells mostly like a forearm.
My final answer is…a forearm. What did I win? ;D