Now legal in eight states, there are unanswered questions about the impact of recreational marijuana on public health. To maximize potency, pot can be purified for maximum THC, its psychoactive ingredient. But a lack of research and restrictions on these…

On November 8, multiple states legalized marijuana for medical or recreational purposes -- so Joe Dolce’s new book on the substance's history in the U.S. is timely. Dolce argues marijuana's bad reputation is a result of political demonization, including an…

On November 8, multiple states legalized the use of marijuana for either recreational or medicinal purposes -- thus marking a major shift in U.S. drug policy. William Brangham speaks with Taylor West of the National Cannabis Administration and Jonathan Hudak…