Trend Alert: 7 OH Kratom And 7 OH Vape Coast Guard bans kratom, similar drugs immediately The supply of high potency opioids is expanding through products sold legally as herbal supplements in gas stations, vape shops, and convenience stores. The most prominent is 7 hydroxymitragynine, also known as 7 OH. Justice Department seizes illegal 7 OH goods across Missouri 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.