I did a 12 hour smoke yesterday using charcoal and wood. I tried 2 types of lump, Cowboy and Royal Oak and some hickory. I like the Cowboy more than the Royal Oak in every way. It had bigger chunks, burned longer and more evenly than the Royal Oak. The Royal Oak had nothing but small pieces. There was also a lot of dirt on the coal ( probably from the manufacturing process ). It might work fine in a water smoker but for a bigger smoker it isn't worth a plugged nickle in my book. It's too fine ( small ) and burns too quickly.