In 2009, when Gupta was possibly in the running to be Barack Obama's surgeon general, medical marijuana was a sham, not supported by science. Somehow, that same science changed four years later. In August, CNN devoted an hourlong special to Gupta's total flip-flop. He was wrong; marijuana is medicine after all.
It appears CNN's embrace of truth was too good to last. This week, one of the network's clinical contributors caused a splash with the claim that marijuana is "probably" a chief cause of gynecomastia, or man boobs.
We don't even have to wait four years on this one. This is a myth already well-exploded -- barely supported as a theory by the studies CNN cited.