phantosmia:
If his phantosmia, or smell hallucinations, are driven by a lack of reliable information, then real smells should help him to suppress the hallucinations. He has been trialling sniffing three different scents, three times a day. “Maybe it’s just wishful thinking,” he says, “but it seems to be helping.” [“You are hallucinating right now to make sense of the world,” Helen Thomson, NewScientist, 5 November 2016, paywall]