[Misc] Can someone explain how lips can start hydrating themselves if you stop using products?

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So I know that people can get stuck with relying on lip products to moisturize their lips, and have to keep applying product or else they feel dry. A "chapstick" addiction as it's called.So people will suggest tapering how often they apply product, eventually only applying once and awhile.But my question is, how exactly does this work? Lips don't have oil glands to hydrate themselves, so what makes one able to feel moisturized if they don't apply product? Can someone explain this concept lolThank you :)
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Submitted by Feelishia