Studies show that, although THC appeared to increase appetites, there is no documented evidence that actual weight gain occurred when compaired to non-THC patients.
Doesn't that depend upon what one eats? Back in my college days I was known to consume a couple of pints of Hagen-Daz in a single sitting. I gained 15 lb. that semester, which I eventially dropped, not because I stopped smoking pot, but because I switched to more nutrious munchies.
I find it laughable that someone who adopts a cheap whiskey as his moniker rails against pot.