There are a few smell-triggered memories (as well as a few event-triggered memories) that I cannot (or maybe just do not) recall unless the trigger is present. A few minutes later, I'll forget what it was, but with the trigger, it's as good as a holographic reproduction of sound, sight, and sometimes other senses.
I occasionally get a whiff of something that really isn't there, but in my mind that's not much different than thinking you saw something out of the corner of your eye or thinking someone called your name when they didn't.
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