Thirty-eight states plus the District of Columbia allow practitioners to recommend medical marijuana for post-traumatic stress disorder. But what if they’re all wrong? A new systematic review of ...

Heavy marijuana smoking may raise the risk of lung cancer and several head and neck cancers, according to growing research, ...

Marijuana use among teenagers is entering a new phase—one shaped not only by changing laws but also by shifting perceptions of risk. As legalization expands across the United States, researchers and ...

Legalization of the drug without much regulation has led to public health challenges. By Emily Bazelon David Leonhardt and German Lopez Produced by Jillian Weinberger See more of our coverage in your ...

Add Yahoo as a preferred source to see more of our stories on Google. A marijuana plant. (Cappi Thompson/Getty Images) Acting Attorney General Todd Blanche signed an order on Thursday reclassifying ...