Up Next
Back to Show
PBS News Hour
Scientists race to learn how marijuana affects the brain
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.
Sign up now for inspiring and thought-provoking media delivered straight to your inbox.
Support Provided By
57:46
June 18, 2025 - PBS News Hour full episode
57:46
June 17, 2025 - PBS News Hour full episode
57:46
June 16, 2025 - PBS News Hour full episode
26:45
June 15, 2025 - PBS News Weekend full episode
26:45
June 14, 2025 - PBS News Weekend full episode
57:46
June 13, 2025 - PBS News Hour full episode
57:46
June 12, 2025 - PBS News Hour full episode
57:46
June 11, 2025 - PBS News Hour full episode
57:46
June 10, 2025 - PBS News Hour full episode
56:45
June 9, 2025 - PBS News Hour full episode
24:09
June 8, 2025 - PBS News Weekend full episode
24:09
June 7, 2025 - PBS News Weekend full episode