The city people out there, might wonder why the heck farmers get used to that "countryside" smell. Although our nervous system has evolved to become progressively less sensitive to a stimulus (in this case a smell). This enables us to concentrate more on the new sights/smells that might pose more of a "danger" to us. We also have what's called an olfactory memory that discards smells that we've experienced recently - so you don't notice the smell of your house when you come back from work, but it smells different when you come back from your holiday!
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