Smell Training can help to treat certain smell disorders caused by viruses and bacteria. The two common types of smell disorders are phantosmia, where you smell an odor that isn’t there, and parosmia, where you smell strange and unpleasant odors — for example, mint smell rotten. Both are believed to be caused by damage to the smell pathways. We have put together a list of resources for those of you who are struggling with smell disorders.