Silliest thing I've heard of (so far today). If the bark did fall off, I'd pick it up and throw it in the fire - those are free btu's going to waste. Actually, that is usually my October and most of November wood - pieces of bark, chips from around the splitter and scraggly pieces of wood which can't be stacked. If the bark was wet, I'd just burn some other wood. Bark is like a sponge and will soak up water - but just like a sponge, it dries out pretty quick, too.