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. Parents: Have You Heard of 7 OH? A new substance called 7 OH ( 7 Hydroxymitragynine) is starting to appear in gas stations, vape shops, and online stores, and many people don't realize the risks. Parent Alert Gas Station Highs You Should Know About Parents, two legal substances you might not know about are showing up in gas stations, vape shops, and convenience stores 7 O'Heaven 7 OH Kratom Vape Pen Smooth, Flavorful Relief Great CBD Shop 7 O'Heaven 7 OH Kratom Vape Pen Master Distributor Wholesale 7 OH, kratom removed in Florida. What to know about addictive drug