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i use a combination of smaller and larger and sawdust
especially when I smoking at lower temp. the dust give me smoke sooner
then the smaller chunks, then the bigger ones. I can get a good 4-5 hour of smoke in my GOSM using this method.
I keep both on hand. I like the smaller ones for light smoking and the larger type for long smokes. Try some of each and take notes of smoke quantity / duration from different sizes..