All wood here.
I keep several variates on hand. I have friends in landscaping and construction so I always seem to get it for free.
I make a fire in a patio fire bowl and refuel with wood that is started. Not very efficient I know.
With my double drum smoker I refuel by throwing logs on raw. Just one log at a time so it does not smother the fire. Works great.
When finished cooking I extinguish and pull from the fire bowl, grill, or smokers anything that is black and solid then store it in a can. Best damn lump you can get.
[COLOR=Black][B]Meat * [COLOR=Red]Salt[COLOR=Black] * Fire