NO!
"While most people who've been sickened were consuming marijuana-based products, a few said they consumed only nicotine-based vape juice."
A "few" said... perhaps because they live in states where using thc/marijuana would result in fines or jail time - sometimes long jail times. OR they didn't want parents to know...
The most obvious action, since 80% (from other sources) used THC, is to test for THC/vitamin E acetate for every case that comes in. If that was done I'm confident that, the 80% goes to 100%.
So no, it isn't the "devices", it's not the metal, solder or coils, or nicotine, it's the THC cut with vitamin E oil.