I need someone who understands the human body and/or chemistry more than I do to clarify something I discovered this week.

In my chemistry lab that I'm taking this semester, my lab mates and I were casually discussing acetone when someone mentioned that they don't put it in nail polish remover anymore because its a potential carcinogen.

A few days later, while trying to understand what exactly keto breath is, I found out that the actual smell comes from acetone (a metabolite of ketogenesis) leaving through the lungs.

Can someone help me wrap my head around the idea that in keto, we are exhaling not only an (old) ingredient of nail polish remover, but also a possible carcinogen?

I know its probably not a huge deal, but I'm a bit freaked out, and would feel better if I understood the science behind it.