Unregulated opioid like drug sold in Lawrence smoke shops News kansan.com Today, we announced the issuance of seven warning letters to companies illegally marketing products containing 7 hydroxymitragynine (7 OH). https: www.fda.gov news events press announcements fda issues warning letters firms marketing products Emerging Drug Alert: 7 OH (7 Hydroxymitragynine) A new substance called 7 OH aka Kratom is being promoted for focus, pain relief, and anxiety, but they come with serious health risks. Reported risks include: 7 hydroxymitragynine Vape 7 O'Heaven 7 OH Cherry Vape Pen