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. The Campaign to Ban 7 OH and "Gas Station Drugs" Shouldn't Take Long Filter FDA asks DEA to classify 7 OH as a controlled substance STACK'D Pure 7 Hydroxymitragynine Disposable Vape 2g Full Case (8ct) 7OH Resellers Florida removes 'vape shop morphine' from stores. What to know about 7 OH, kratom FDA recommends 7 OH compound found in vapes be controlled Reuters