Weeding out the pain

Jeffrey Kahn’s father-in-law spent decades searching for relief from his multiple sclerosis. In the 1960s and 70s, he traveled the globe looking for a cure for the painful disorder. “[He] tried every kind of pharmaceutical you could imagine,” Kahn says. “Drugs, snake venom, you name [it] and he tried it.” Eventually, a doctor recommended marijuana. It was illegal, but Kahn’s father-in-law used it anyway. And, unlike all the other medicines and drugs, he felt that marijuana made a difference. “So we knew for decades that it was something th…