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So I have been using wood chunks but after 1h or so the smoke stops and is completely clear. Also, when I use my electric smoker with wood chips, added every hour, the food does taste more "smoky".
So I bought thiscast iron smokebox. Works like a charm.
i found this ... mini logs split into 1-2 inch laid in a triangle pattern then lump added over this i get smoke through -out the cook.. plus a couple chunks on top works really well!