Cigarettes constitute a mere 20 percent of tobacco consumption in Ghana, and fewer than 15 percent of the 200 million tobacco users consume cigarettes. Yet these 15 percent contribute nearly 90 percent of the tax revenues to the exchequer from the tobacco sector. The punitive cigarette taxation regime has kept the tax base narrow and reducing taxes will expand this base. Which of the following best strengthens the conclusion that reducing duties will expand the tax base?