Scientists race to learn how marijuana affects the brain
Clip: 07/10/2019 | 9m 22s
As national attitudes and laws around cannabis use have evolved, so have the commercially grown strains of the plant. Some marijuana varieties today contain levels of THC, the drug’s psychoactive compound, as high as 50 percent, compared to around 5 percent a generation ago. But as science correspondent Miles O'Brien reports, the effects of cannabis on the human brain are still relatively unknown.
Aired: 07/10/19Video has closed captioning.
Problems Playing Video?
Major corporate funding for the PBS NewsHour is provided by BNSF, Consumer Cellular, Leidos, Babbel, and Raymond James. Funding for the PBS NewsHour Weekend is provided by Mutual of America. For a complete list of funders for the PBS NewsHour and PBS NewsHour weekend, click here.