Rule of thumb is to not trust any vape you didn't buy at a legal dispensary.
Fake packaging, and even prefilled fakes can be purchased in bulk online.
You only get one set of lungs. The mediocre high you might get isn't worth the potential long term damage.
If you can source clean concentrate, you can learn to fill your own with a few basic items. Much safer than BM carts.
/r/fakecartridges on reddit has a lot more info, I'm not sure what the lemmy equivalent is.