Delta 9 THC is a naturally occurring cannabinoid present in the cannabis species (hemp and marijuana). This substance is composed of carbon, hydrogen, and oxygen. Several experts believe that THC protects plants against UV light (like a "cannabis sunblock"). Because of its structure, it can interact with the endocannabinoid system within the human body. For many, the effects of this relationship are desirable and gratifying. Delta 9 THC is a naturally occurring cannabinoid present in the cannabis species (hemp and marijuana). This substance is composed of carbon, hydrogen, and oxygen. Several experts believe that THC protects plants against UV light (like a "cannabis sunblock"). Because of its structure, it can interact with the endocannabinoid system within the human body. For many, the effects of this relationship are desirable and gratifying.