The herbal stimulant khat is to be banned by the British government—against the advice of its own Advisory Council on the Misuse of Drugs. In January the ACMD said khat should remain a legal substance, finding "insufficient evidence" it caused health problems. But Home Secretary Theresa May announced her decision to ban it last week, saying the risks posed could have been underestimated. Khat will be treated as a class C drug, along with anabolic steroids and ketamine. The Home Office said the ban was intended to "protect vulnerable members of our communities."