About 30 minutes later, I realized that the 2 by 4 wasn't burning and was making a funny smell. I got a tool and took it out. Immediately I was flooded with awful, toxic smelling smoke, that made me feel dizzy. I dropped it and had to sit on the ground, that's how powerful it was. It was still smoldering, so I dumped it outside in the snow. Later, I went out to it when it was less hot, and I realized that I could peel off the wood looking part. It had something that looked like some sort of plastic on the inside.
I could've sworn wood cut places are supposed to sell wood.
Here is a picture of what I tried to burn, whatever it is.