Marijuana use has become increasingly common across the United States as more states legalize cannabis for medical or ...

Nearly nine-in-ten U.S. adults say marijuana should be legal either for medical or recreational use. Just 11% say the drug should not be legal at all.

Teen marijuana use has hit its lowest point in over three decades, a new study reveals, defying concerns that legalization might spur a rise in use among young people. The University of Michigan’s ...

NEW YORK -- Using marijuana daily for years may raise the overall risk of head and neck cancers three- to five-fold, according to a new study that analyzed millions of medical records. "Our research ...