Pot Is Becoming More Potent — and Riskier

Although some states have legalized “medical” or recreational use of cannabis, illicit use remains more common. These investigators analyzed the proportion of Δ9-tetrahydrocannabinol (THC), cannabidiol (CBD), and other cannabinoids in 37,606 samples of cannabis plants seized by the U.S. Drug Enforcement Administration from 1995 through 2014; the samples consisted of marijuana (female pollinated or male plants), sinsemilla (unpollinated female plants), ditchweed (hemp), and other preparations.