FILE - Products on display as vendors, buyers and visitors attend the Canapa Mundi international hemp fair on February 21, 2020 in Rome, Italy. (Simona Granati - Corbis/Corbis via Getty Images)Researchers at the University of South Carolina believe the most potent chemical found in cannabis, tetrahydrocannabinol (THC), could be effective in treating some potentially lethal COVID-19 complications, according to a preliminary study published in Frontiers in Pharmacology, The study, co-published by Prakash Nagarkatti, found that THC in mice could prevent a harmful immune response that causes Acute Respiratory Distress Syndrome (ARDS) called Staphylococcus aureus and its enterotoxin, SEB, and could cause a significant increase in healthy lung.