I just had a customer who smelled like he had been swimming in an ashtray for the last 30 years. It wasn't even fresh cigarette smoke smell, or cigarette smoke breath. It was stale, gross cigarette smell, like when you leave an ashtray outside and it gets water in it and you discover it several weeks later.
I literally had to hold my breath while I was waiting on him, to avoid throwing up.
People are just gross sometimes. How can you not know that you smell that bad?
If you're ever around me, and I stink to high heaven, please tell me so I can go take a shower.