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I can definitely confirm that one or the other of my nostrils is always stopped-up. Currently, for example, my left is the clear one, and if I block it with my finger I am in danger of passing out very shortly. But I always assumed this was just allergic congestion, and that my nostrils switched blockage when I laid on one side or the other simply because the gravity shifted the mucous downward into the lower nostril.
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