I never heard that there could be a difference between the left and right nostril.
The first thing that happened to my father was that he had a few mini strokes. These were strokes that lasted only about 3 seconds. He thought he was going to fall down but it didn't last long enough for him to fall. Then the next thing we noticed was that he had NO sense of smell, and that was with both nostrils. About 3 decades later he was diagnosed with Alzheimer's.
But loss of smell alone will not give you a diagnosis of Alzheimer's with any certainty. That's because there can be other causes.
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