Edward Krumpotich, a drug policy consultant based in Minnesota, was diagnosed with severe attention deficit hyperactivity disorder at age 15 — but he didn’t get help for it until he was 37. In the interim years he suffered from methamphetamine addiction, which he later realized was driven by attempts to self-medicate his untreated A.D.H.D. He attended more than 30 rehabs before one finally prescribed stimulant medication for him.