It depends. Everyone seems to have a somewhat unique experience, but in many cases, it’s not pleasant.

Some people with parosmia will experience the same unpleasant scent for a variety of things (so, lemons and coffee may both smell like garbage) while others will experience unique scents for different objects.

Parosmia is typically treated with something known as olfactory training or scent training, which involves inhaling a particular scent and thinking about what that scent should smell like. So, if you were inhaling the scent of lemon, you would try to remember what lemon smells like at th...