Moreover, while both hemp and marijuana are cannabis plants, they differ in their THC content. Hemp must contain less than 0.3 percent to be legal at the federal level. Sarah Ratliff, a 52-year-old woman who has been using marijuana for pain relief for many years, says she didn’t perceive any benefits from trying CBD oil. But when she tried smoking and vaping cannabis — which has both CBD and tetrahydrocannabinol — to improve her sex life, she noticed big improvements. Currently, the only CBD product approved by the Food and Drug Administration is a prescription oil called Epidiolex.