This is the reason regulations and control are needed. We need to know that when we walk into a shop and buy E liquid that there is some level of checks and balances. That responsible ingredients are being used and that newest flavor you bought isn't some sub standard liquid that could cause harm far worse then you ever considered.
Say a brand is GRAS at a certain level but at a level far above that its considered dangerous, however at the current state of affairs a vendor can add any level of this chemical they want, perhaps to boost their flavor and sales, the reason doesn't matter, but what does matter is safety and right now there's no safety standards.
Say a brand is GRAS at a certain level but at a level far above that its considered dangerous, however at the current state of affairs a vendor can add any level of this chemical they want, perhaps to boost their flavor and sales, the reason doesn't matter, but what does matter is safety and right now there's no safety standards.