Not sure why you are being downvoted. Negative placebo effect is real and anosmia (smell blindness) has been making headlines with the 'rona. To answer the ori

Not sure why you are being downvoted. Negative placebo effect is real and anosmia (smell blindness) has been making headlines with the 'rona. To answer the original question: "Postviral olfactory disorders usually occur after an upper respiratory tract infection (URTI) associated with a common cold or influenza. With a prevalence between 11 and 40% they are among the common causes of olfactory disorders." From here: https://pubmed.ncbi.nlm.nih.gov/16733337/?from_term=anosmia+influenza&from_pos=3 https://pubmed.ncbi.nlm.nih.gov/16733337/?from_term=anosmia+...