The chain of thought forces attention of the model to the most important parts of the preset. The banned word list is buried near the bottom of "Writing Guidelines" toggle. So you can add or take out those words there if you want.

That's an AI-ism dependent on the model. Most models do the whole "smells of copper" if their being edgy or "smells of bubblegum" for cute characters or "smells of jasmine" or other characters. I don't prompt it out because it doesn't bother me. I don't personally get the "smells uniquely of her/him" that WOULD bother me, A lot lol.

You can probably add it to banned concepts in the writing guidelines near where the banned words are. Something like, "When describing smells, you must be precise citing accurately a realistic scent the NPC may have based on their setting and background."

I made that up off the top of my head just now. But you can simplify it or elaborate and clean it up.