So: there's an unknown number of contaminated liquid vape cartridges, all of which so far were THC? And since the substance is illegal it's going to be impossible to do a recall. This is a major health risk, and I wouldn't vape liquid THC for the near future.
My understanding of the issue is that the THC cartridges causing these problems are all done by unregulated black market producers. THC cartridges have been available for years in a number of legal states and there have been no reported issues with those cartridges purchased from licensed dispensaries. I've lived in legal and illegal states, and I would not buy or use black market cartridges. To further conflate things, many black market cartridges steal the branding of legitimate cartridges in order to pass themselves off as authentic.
Individuals can and should make their own personal decisions regarding their usage. My issue is with the media's inaccurate reporting causing people to make these decisions based on incorrect data. For instance, you have people who nicotine vape who are now concerned about their usage, despite the fact there's been no conclusive evidence linking these ailments to nicotine cartridges.
Conspiratorially, I have a feeling there are many corporate players who would benefit from and encourage this kind of fear mongering, but that is my own personal baseless speculation.