He doesn’t just say he was wrong, he apologizes:

We have been terribly and systematically misled for nearly 70 years in the United States, and I apologize for my own role in that.

CNN’s Dr. Sanjay Gupta does an about-face on marijuana http://t.co/jjLPOb0j4I - Wow…good for you Sanjay.

— Sean McCabe (@darthstar99) August 8, 2013