Is it possible vaping did not suppress your appetite like smoking did, and so your stomach created more digestive acids, but you didn't eat more because of habit?
GERD/nicotine has a pretty strong link and it’s cumulative/long-term exposure that increases chances. Probably just a ticking time bomb that went off ;-).
(No offense to the parent poster intended, I likewise have played games with this same time bomb multiple times now)