Several THC products have been identified as possible culprits in mysterious lung injury cases. Dank Vapes along with several other brands that package THC filled vape cartridges have been linked to a majority of the illnesses throughout the country. According to health officials, about 87% of those interviewed had vaped THC from pre-filled cartridges bought from unknown sources.
https://www.nytimes.com/2019/09/27/health/vaping-illness-thc.html