Expect a major blow to the head from this super-potent strain. A pure sativa, Durban Poison is the beloved inbred descendant of a sativa strain grown in South Africa.Durban Poison has THC levels that can reach 24%, making it one of the world's more powerful strains.Durban Poison is an effective treatment for depression and anxiety, as well as chronic pain, and it can also be helpful with nausea.