Prior to filming our first documentary on cannabis a decade ago, I was highly skeptical about its use as a medicine. I had even written a story for TIME magazine a few years earlier to make the case that the evidence simply wasn’t there.

Editors Note: Weed 7: A Senior Moment premieres Sunday, August 6, at 8 p.m. ET/PT on The Whole Story with Anderson Cooper.
Prior to filming our first documentary on cannabis a decade ago, I was high…