MMMM Mesquite wood smoked Delmonico's
:P What a delight!
Back when people started smoking hookahs they didn't have 3 Kings or finger coals, they used a hot coal from a fire they had going. The warning folks give about Bar B que coals are for stuff like Kingsford, Match Lite, Royal Oak etc. briquets.
It's best to stay with coals made for hookah unless you know for sure they are safe.