Some of the earliest prizes were cigarette cards — trade cards advertising the product (not to be confused with trading cards) that were inserted into paper packs of cigarettes as stiffeners to protect the contents. Allan and Ginter in the U.S. in 1886, and British company W.D. & H.O. Wills in 1888, were the first tobacco companies to print advertisements and, a couple years later, lithograph pictures on the cards with an encyclopedic variety of topics from nature to war to sports — subjects that appealed to men who smoked. By 1900, there were thousands of tobacco card sets manufactured by 300 different companies. Following the success of cigarette cards, trade cards were produced by manufacturers of other products and included in the product or handed to the customer by the store clerk at the time of purchase. World War II put an end to cigarette card production due to limited paper resources, and after the war cigarette cards never really made a comeback. After that collectors of prizes from retail products took to collecting tea cards in the UK and bubble gum cards in the US.