He lauded the U.S. government's campaign against smoking tobacco, but said that the U.S. has taken the opposite approach to pot.
"Smoking marijuana is quite the opposite. That’s on the rise, as pot use is considered cool in many circles, and above all it is political correct," he said.
He then claimed that "smoking pot hurts the brain," referencing a new study published this week in the Journal of Neuroscience. The study found that marijuana use can cause abnormalities in certain parts of the brain.
Watch the clip via Fox News:
Image via WFSB News, re-aired footage of O'Reilly in 1979
[H/t Huffington Post]