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. 7 O'Heaven 7 OH Vape Pen 7OH Speciosa FDA Pushes to Classify 7 OH Sold in Vape Shops as Illicit Drug Ecigator FDA pushes for ban of potent Kratom derivative 7 OH amid safety concerns ABC30 Fresno 7 OH: What to know about the popular opioid like drug Florida just banned