i am planning on smoking my fist boston butt this weekend, i plan on only using the wood that i have. i have plenty of hickory, pecan, assorted oaks, red maple, green ash, wild black cherry. which wood would be best for retaining heat/coals the longest. i would assume the hickory because it is so dense. any help would be greatly appreciated. oh, it's a SFB, medium size smoker i made.