war baby
n.— «As predicted, hemp proved little more than a “war baby,” a term for an industry wholly dependent on the peculiar economics of wartime. The Lexington mill closed in 1945.» —“Hemp once grown around Lexington to support war” by Bill Steinbacher-Kemp Pantagraph.com (Bloomington, Illinois) June 23, 2007. (source: Double-Tongued Dictionary)