People who aren't mentally ill are sensitive to smells. There can be many reasons for it.

For example, my grandmother gave me the okay to smoke my E-cig in their house, but when I came up last week, my Papa had my grandmother tell me that the smell made him nauseous even when it did not bother my grandma at all.

My mom is also hypersensitive to smell. She gets all P.O'd after I smoke cigarettes (I smoke both, trying to quit cigs) and she will febreeze the entire house.

Personally, when I quit smoking, I could smell so many things I couldn't smell before.

So who knows why you are sensitive smells, but it may have nothing to do with mental illness. Some people are more aware than others.