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[–] 4 points 9 months ago* (last edited 9 months ago)

You either have tonsil stones or a chronic sinus issues. Talk to an actual doctor.

Edit: But in answer to your question ... the smell is bacteria that your sneeze has stirred up.
Tonsil stones are basically piles of bacteria. Chronic sinus infections are more bacteria. Those are the two most likely sources.

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