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. FDA Pushes to Classify 7 OH Sold in Vape Shops as Illicit Drug Ecigator Kratom Vapes: How They Work, Benefits & Buying Guide Delaware bills would regulate or ban kratom products WHYY