Taxing “sin” is one of the oldest and most persistent forms of selective taxation. Founding Father and Treasury Secretary Alexander Hamilton is said to have imposed a tax on whiskey “before the ink on the US Constitution was dry.” Motivated as much by a need to increase revenues as by a desire to do good, politicians often claim that “sin taxes” will fund projects that promote public health as well as curb unhealthy behavior. Yet sin taxes often represent inefficient public policy and may ...