That is surprising to me, considering the sheer number of phones/tablets/laptops on every flight. Does anyone maintain a list of incidents?
Phones, tablets, and laptops are not sold in bodegas, designed to be disposable, and thus made as incredibly cheaply as possible.
The high end vapes use huge amounts of current to the point that vape users will specifically seek unprotected cells because the protection circuitry adds a slight bit of internal resistance.
So then the unprotected cells can then short out in their bags or otherwise be damaged and fail when the vape electronics fail...
I can't imagine that the QA process for vapes is better than even the _super_ budget tablet or phone, though.