I wore a "Legalize Crack" sandwich-board to a rally once and got a similar reaction. The rally was supposed to be against drug testing for students receiving grants (proposed by Reagan), but turned into a celebration of marijuana. I kept telling them to light up and chill out, to no avail.
Had to rewind a couple times but he does say "marijuana makes you worst" ~2:04
Also that it makes you hungry is good if chemotherapy has destroyed your appetite. I'll jump to the conclusion that he's never seen someone starve while actually beating cancer.