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Can smells live in your nose and come out unexpectedly?

I'm smelling coffee brewing. Very strong and unmistakable but there isn't any brewing 馃槼
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SethGreene531M Best Comment
Sometimes a sense memory is triggered so profoundly, that the person may smell or taste an aroma. These are often things the individual has been exposed to in the past -- like brewed coffee.

If an aroma is present in the absence of an apparent source or visual cue, it may be synesthesia.
Accompanying visual cues, it's called olfactorization.

I get the acrid-sweet smell of jet fuel if a plane is taxiing by on tv.
Or the grease and diesel, and tar of a construction tractor parked in a lot with my windows up.