Doctors are warning about a substance they call gas station heroin that is available over the counter at vape stores across Arizona. The product is called 7 OH, a component derived from kratom. What Is a 7 OH Vape? Safety, Legality & Alternatives Buy 7oh Vape PainCrusher Rx 7 Oh 2 Gram Disposable Vape Cloud Nine Shoppe The supply of high potency opioids is expanding through products sold legally as herbal supplements in gas stations, vape shops, and convenience stores. The most prominent is 7 hydroxymitragynine, also known as 7 OH. FDA Pushes to Classify 7 OH Sold in Vape Shops as Illicit Drug Ecigator