cannabis

Investigators have found that cannabis-containing vaping products are linked with many of the reported cases of vaping-related lung illness. Mike Wren/AP hide caption

U.S. health officials are again urging people to stop vaping until experts figure out why some are coming down with serious respiratory illnesses. Richard Vogel/AP hide caption

The New York State Department of Health said Thursday that it is looking at vitamin E acetate as a potential cause of severe pulmonary illness cases in the state that have been associated with vaping. Daniel Becerril/Reuters hide caption

California says revenue from marijuana sales has risen — but analysts say the illegal market is still thriving. Here, an employee puts down an eighth of marijuana after letting a customer smell it at the Magnolia cannabis lounge in Oakland. Elijah Nouvelage/Reuters hide caption

Scientists exhumed 10 wooden braziers from eight tombs at the ancient Jirzankal Cemetery in what is now western China. Many of the braziers held stones that were apparently heated and used to burn cannabis plants. Xinhua Wu/Science Advances hide caption

A bipartisan group of attorneys general is urging Congress to pass legislation that would make it easier for banks to handle money involved in the legal cannabis industry. Brennan Linsley/AP hide caption

Cannabis: The Illegalization of Weed in America, by Box Brown First Second hide caption

Research shows a link between marijuana use and psychosis. Kirill Vasikev/EyeEm/Getty Images hide caption

The rain didn't stop customers from lining up outside Cultivate in Leicester, Mass., on Tuesday — the first day that sales of recreational marijuana became legal in the state. Steven Senne/AP hide caption

Even a week without marijuana use improves young people's ability to learn and remember. BURGER/Canopy/Getty Images hide caption