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For example, there are sensory neurons in our noses that bear receptors uniquely tuned to detect ethyl vanillin, the main odorant in vanilla, and other cells with receptors for limonene, lemon's signature odorant.

One molecule of concern is limonene, a commonly added to cleaners and furniture polish to help remove oil and grease.

For example, one version of the molecule limonene — the right-handed one — smells like lemon, and its mirror image, which is left-handed, smells like orange.

This hybrid strain is limonene dominant, and many report feeling energetic and uplifted after consumption.

Fortunak said the process of boiling citrus rinds in water isolates a natural chemical compound called limonene, which has health benefits, but is “assuredly not hydroxychloroquine.”