After years of stalling, the agency says it plans to provide notice on pending applications from growers—but only after it establishes new regulations for suppliers.

Originally intended for basic neuroscience research, the drugs were ultimately hijacked for illicit recreational use.

US scientists continue to have a hard time getting funding to study the health impacts of the drug. But cannabis research in Canada—where medical marijuana is legal nationwide—is different story.

As nonconventional medical treatments become increasingly mainstream, we take a look at the science behind some of the most popular.