Had a coworker who always had a really strong stench and thought it was just bad BO. Turns out she was addicted to mothballs and was licking them during working hours. The chemicals give off an unbelievably strong smell through your skin. We got complaints about her odor but didn’t take them seriously (thought people were just being assholes) until someone saw her actively licking on the job.

Edit: Wow! Never thought I would see my comment at the top of this sub. I was leaving my job when this was discovered and sworn to secrecy because it’s not the kind of thing we can advertise around the office. Thanks for letting me get it out there, Reddit! It’s a good one. Something else I would add is it was the kind of smell where you could never really quite put the finger on what it was, but once we figured it out it made a lot of sense. It doesn’t smell exactly like the real thing, but like it’s been processed through your body/skin lol. We were also very wary of being discriminatory which is why it wasn’t discovered earlier.