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You must NEVER smoke or perform any activity involving fire within 25 feet of

You should not risk smoking in close proximity to any class of hazardous material, but there are specific rules for the following classes: No smoking within 25 feet of classes 3 and 2.1 (flammable materials and gases). No smoking or holding a lighted smoking object such as a cigar or pipe within 25 feet of classes 1, 3, 4, or 4.2 (explosives, flammable liquids or solids, or spontaneously combustible materials).