The Lambert Center at Jefferson plans to investigate the therapeutic uses of several substances, called cannabinoids, that are found in the cannabis plant. THC, the psychoactive ingredient in marijuana that produces the high, is the best known of the compounds. But researchers have found some evidence that cannabidiol (CBD), in conjunction with other cannabis substances, works to tame violent seizures in children, PTSD in veterans, and chronic neuropathic pain. The oil used to treat Katelyn Lambert is primarily CBD.