For example you open a new air freshener and you smell it and it lasts for a few days but does your nose ‘get used’ to the fragrance and you stop smelling it?
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A lot of people did a great job explaining the biological part of your question. There’s also a psychological aspect, though.
Things you experience a lot (like smells, sounds, etc.) are blocked out by your brain. It’s used to them, and doesn’t find them interesting. It’s why farmers aren’t bothered by the smell of manure. They’re so used to it that their brain blocks it out.
The biological part explained in other comments applies when you’ve been around the smell for a short, continuous while. The psychological aspect (called habituation) applies when the smell or sound is recurring.
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