To the Editor Dr Whiting and colleagues presented a systematic review of medical cannabinoids.1 The University of California Center for Medicinal Cannabis Research has conducted 5 placebo-controlled clinical trials with smoked or inhaled cannabis for neuropathic pain, representing, to my knowledge, the only studies approved by the US Department of Health and Human Services to be conducted in the United States during the past 2 decades.
Grant I. Medical Use of Cannabinoids. JAMA. 2015;314(16):1750-1751. doi:10.1001/jama.2015.11429