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Impairment in the sense of smell, also known as olfactory dysfunction, is one of the symptoms of obstructive sleep apnea (OSA) that people usually overlook. People with olfactory dysfunction aren’t able to identify or differentiate between odors. This link between obstructive sleep apnea and the sense of smell is noticeable once OSA patients undergo CPAP (continuous positive airway pressure) therapy and experience an improvement in their sense of smell. Obstructive …