Mildew and Mold are part of the rotting process, this is not prime material for smoking wood. It does depend to the extent of the mildew or mold if you will notice on the food. I would pick something without this condition if possible.
Jim
Thanks Jim.
There were very little mildew spots under the bark, but its better to be safe than sorry.I didn't know how old the wood was so I'll forget about it.
Willy T.