Thicker is better, but it also depends on how much food you need to smoke with it. If you're only doing a couple of butts or a brisket, a steel drum has sufficient thickness. For larger rigs, i've seen people use all the way up to 3/8" thick.
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2 UDS: Sean "Puffy" Coals & Tupork, 275g oil tank smoker: Piggy Smokes, in progress
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