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In fact, there are multiple products sold commercially for this very purpose. At least one of them is killing people. Do legit manufacturers use them? Who knows. It does seem like they picked a main ingredient you're specifically not supposed to inhale.
The simple argument against weed vape carts: they're new and popular, e-cigs are established and presumably following a more stable growth curve. This isn't quite enough. The telling link is the reason this adulterant would show up in the first place, which i think is established
