Losing the sense of smell is not uncommon with upper respiratory infections (URI), typically with a viral common cold or flu. According to some studies, smell loss or decrease may occur between 18-45% of patients who suffer from a URI. It is estimated that about 1/3 of such patients will fully recover their sense of smell with 2-3 years, most within the first year. Unfortunately, that leaves 2/3 of these patients who suffer from some degree of smell dysfunction. The key determining …