dog cigarette cards Cards: Dogs (1937) (50 cards) Framed Antique Dog Cigarette Card,

The paper displays a pattern of concentric circle striations called "burn rings." The burn rings correspond to two different thicknesses in the paper, which serve to precisely control the speed at which the cigarette burns, slowing it automatically when the smoker is not inhaling in order to prolong the cigarette's consumption and speeding it up as the smoker takes a drag so as to maximize smoke intake

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Thomas also said the U.S

There is strong demand for the product, though, and it is likely healthier than cigarettes, so there is a compromise to be made with regulators in the coming years