Amid kratom crackdown, FDA warns 7 OH may be next wave of opioid crisis Morning in America 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 7 OH 7 Hydroxy Disposable Vape Banana 1ml 7 OH Vape