Chrissi Kelly lost her sense of smell 14 years ago after a virus during a family trip to the Czech Republic. Months of doctor visits led to an anosmia diagnosis, but the loss felt catastrophic to her. Researchers estimate up to 22 percent of people live with smell impairments including hyposmia, anosmia, phantosmia, or parosmia.

The pandemic transformed how medicine views smell disorders. With 60 percent of COVID patients experiencing temporary or lasting smell loss, millions of noses worldwide malfunctioned simultaneously. This created unprecedented research interest into a sense previously dismissed by scientists. French researcher Paul Broca once called olfaction the 'bestial sense,' but modern research proves that assumption wrong.

Smell connects directly to emotion and memory centers in the brain through olfactory bulbs, which are among few brain regions that generate new neurons in adulthood. These same bulbs are also the most vulnerable brain region - a potential entry point for viruses and toxins. Kelly describes them as 'two little earthworms lying in their crypts' above the nasal cavity.

Loss of smell often signals serious conditions like Parkinson's disease, Alzheimer's, and Lewy body dementia. Dave, a wine lover, lost his smell 20 years before tremors led to a Parkinson's diagnosis. Scientists have linked smell disorders to 139 different conditions, making smell loss a potential early warning system and public health concern.