When we get a smell, it is due to the brain, and not the nose. The nose collects scent molecules through odour receptors and information about these molecules passes on to the brain. The brain decodes this information and besides identifying the molecules, decides whether the smell is an indication of a threat or is harmless. If harmless, it ignores the smell after two or three breaths. So if you dab on perfume you’ll get a whiff or two and then you won’t smell it again, though others will.
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