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Some people are born with a poor sense of smell or taste. Upper respiratory infections are blamed for some losses, and injury to the head can also cause smell or taste problems. Loss of smell and taste may result from polyps in the nasal or sinus cavities, hormonal disturbances, or dental problems.
The common cold and upper respiratory tract infections are the main causes of loss of smell. Some studies have indicated that regular smokers' sense of smell is weaker than non-smokers. Researchers in this study found a link between an impaired sense of smell and MG (myasthenia gravis).