In this cookbook I have, it says it's a fruit.
"'They've outlawed the number one vegetable on the planet,' bemoaned New Age guru and acid head Timothy Leary, back in the sixties. And while it's not actually a vegetable(technically, it's a fruit), it is true that for some reason goverments really have it in for this seemingly innocuous plant."
I don't see why The Cannabis Cookbook would lie to us about that. Yes, I am taking their word that pot is indeed a fruit, because whoever wrote this book obviously did their research according to the long introduction about weed and cooking weed, and wouldn't just throw that in there without looking into it.
Marijuana=Fruit