I am not sure either...there is no regulation
but those boxes can just be bought and from what I read, and put what ever you want in there
But at least in Seattle, you go into the place and they know the product and who they bought it from
so there is some level of trust there that they know the vendors and want to continue to do business
When I say blackmarket, it's the guys who sell them on the street or in these Pop-ups
you go and it's a lot of random vendors
So I'm not familiar with any of the 'big brands' you listed
But I'm sure in states like Colorado, Washington and Cali, there are credible vendors who you can trust
I personally don't buy the cartridges, pretty much all flower or 'sick' edibles
but I have a lot of friends who do and hope their source wasn't using this Vit E technique
who would have thought something like Vitamin E would be somewhat toxic when heated up and vaporized
I guess my comment is, how can you trust any on the market now
not like there is a test for verifying the content
I just think there are going to be crash in the price (gotta imagine that has already happened...but I don't know)
but when you can get for $5 what was $25, lots of people will buy
I have got to imagine that the people who make these cartridges have 100s of thousands if not millions of dollars invested in already made cartridges...and they don't want to lose their money
I only play a pot dr on the internet...I know very little on this topic on this level