Burning Zelkova smells

We've collected some kinds of firewoods for the bornfire by which having a warm during waiting for the first sunright. There were firewoods that have trouble igniting. Though I've thought that those firewoods were wet, it wasn't wetness that caused trouble on igninting.

Some woods are suited for the bornfire but othres aren't. I studied an authoritative book about the bornfire, and found that ill-igniting woods we've had trouble were seemed to have been zilkove tree. According to the book, zilkove is so dence that hardly ignintes. The book also says that burning zilkove smells bad. In fact, it smoked a lot and the smoke smelled terribly.



Since zilkova is planted everywhere as the roadside tree, I have to watch out.