So Herrera, who's experienced her own share of pain due to a shoulder injury followed by a bout of Lyme disease, went to a local herb shop and bought a vial of the oil, which, by some definitions, is legal in all states if it doesn't contain more than 0.3 percent THC – the psychoactive component of cannabis. She began putting seven to nine drops under her tongue first thing most mornings – and was startled by the results. "It's changed my pain level, my anxiety level and my stress level," says Herrera, who already practiced yoga, meditated regularly, ate a healthy diet and tried conventional medical treatments for pain and mobility. "It was shocking," she says, because she thought her patients' reports were due to the placebo effect. "Right now," she adds, "I feel pretty amazing."