“This is a very serious concern, and one that is unfolding every day,” said MSDH State Epidemiologist Dr. Paul Byers. “While we know that many of the cases in the US report vaping cannabis products, such as tetrahydrocannabinol (THC), some have reported only vaping nicotine products. There is still a lot that we don’t know about what is making these people sick. No specific product such as the device, liquid, refill pods or cartridge has been clearly identified as the cause.”