sanjay gupta (screenshot)*Dang, all these years CNN’s Dr. Sanjay Gupta was wrong! Wrong about the medicinal value of marijuana.

In fact, he feels so bad about being wrong that he has apologized, reports ABC News:

“I apologize.”

That’s what CNN’s chief medical correspondent Sanjay Gupta said about marijuana on Thursday.

For years, he spoke out against the drug, which the U.S. government classifies as one of the most dangerous illicit substances that have “no accepted medicinal use and a high potential for abuse.”

Now, after investigating the plant for his upcoming documentary “Weed,” he’s come to the conclusion that he may have been wrong.

“We have been terribly and systematically misled for nearly 70 years in the United States,” he wrote.

Gupta decided to take a scientific approach to evaluating the drug, going back to the original research that led to it being classified as a “schedule 1” substance, on par with heroin.

Read/learn more at ABC News.

Watch Dr. Gupta tell why he changed his mind:

Watch Dr. Sanjay Gupta’s groundbreaking documentary “WEED” at 8 p.m. ET August 11 on CNN.