FDA Pushes to Classify 7 OH Sold in Vape Shops as Illicit Drug Ecigator 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. WARNING: Georgians should be aware of a synthetic opioid known as 7 OH that's flooding gas stations and smoke shops across the state. These harmful and addictive drugs are sold like candy, and More people are getting hooked on this gas station drug, PA addiction physician says