I have a hyper sensitive sense of smell. Sometimes useful, most often a nuisance.
At work the roof had small leak few years ago, I could smell the wet concrete several days before the water reached the ceiling of the upper floor office and became visible. I told my boss about the leak as soon as I had first smelled it and located the correct room. "There is no leak here, you're just imagining things" was the response after I showed the room to my boss. "There is and we shall see in a few days." After 4 or 5 days the ceiling started dripping water and I received an apology.
I've been able to mentally bypass most of the awful smells of the world and people around me as long as I can remember, so it isn't so bad. But after a few drinks the mental filter turns off and I can smell everything, including my own metabolized alcohol infused sweat. That is not fun at all.