I guess not preheated would be the way to go, because before you replied, I threw them in the oven, raped in aluminum foil, pre-heated at 300, and they didn't work that well. They did work a little though, but not as much as they should have.
I've heard alot about these edible arrangements that make for a good long lasting high, or so I've heard. I would like to know more about these, 'FireCrackers'. Like how to make and cook them. And would it make for optimal high if I ate them on an empty stomach? I'm going to be buying some...