7 C.F.R. § 29.2560

Tobacco as it appears between the time it is cured and stripped from the stalk, or primed and cured, and the time it enters into the different manufacturing processes. The acts of stemming, threshing, sweating, and conditioning are not regarded as manufacturing processes. Tobacco, as used in these standards, does not include manufactured or semimanufactured products, stems, cutting, clippings, trimmings, siftings, or dust.