What is this im coughing up?

for many years now i occasionally cough up a yellow substance that looks like a clump of plaque but it doesn't smell none to fresh its squishy like plaque all be it a little firmer and like i said its been for years so it doesn't seem unhealthy i'm just wondering what it is its not phlegm i know what... show more for many years now i occasionally cough up a yellow substance that looks like a clump of plaque but it doesn't smell none to fresh its squishy like plaque all be it a little firmer and like i said its been for years so it doesn't seem unhealthy i'm just wondering what it is its not phlegm i know what that looks like i don't smoke or anything in fact sometimes its not a cough but just exhaling that brings it up so i was just wondering what it is?
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