I have been reading the posts about types of wood to use. I was wondering if anyone has experience with two types of wood I have collected. My neighbor cut some large limbs off of her Locust tree (Robinia). Does anyone have any experience using this wood in their pizza oven? Also, I have collected the wood from a dead Summer Holly (Comarostaphylos), which I know is related to manzanita and madrone, so I do feel pretty safe about that. I just want to make sure the wood I am going to use is going to be safe to cook with, i.e. are there be any toxins in these types of wood. Are there types of wood to definitely stay away from? (I have read some of the discussions about Walnut and Eucalyptus).