A 45-year-old man presented to the clinic with complaints of brown tongue discoloration. According to the patient, the coating had been present for several years, but it had become more noticeable over the past two months. The patient considered the plaque to be asymptomatic, although his friends had occasionally commented on his malodorous breath. He had never sought treatment for this condition, and to his recollection, no one in his immediate family had ever suffered from a similar disorder. The patient reported smoking less than one pack of cigarettes daily. He was in otherwise good health.

What is the diagnosis?

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