this could be total B.S. but it sounds good to me...
Analogs contained tar that would stain your teeth and cause them (and your taste buds) to become much less sensitive. Now that you've been Vaping, your ditching the Tar. which means your teeth will slowly become whiter, and more sensitive. Increased sensitivity is a good thing. It means your health is improving and your mouth is becoming (no offense whatsover) cleaner overall. I imagine you'll even be taking bigger breaths and tasting food more clearly as well soon!