Taxing behavior deemed -politically incorrect- has long been a convenient way for politicians to fund programs benefiting special interest groups, to the public's disadvantage. Government policy toward various goods--drugs, tobacco and alcohol, for example--has been locked into a regulatory cycle of tax and taboo. Support for legalizing other substances is buttressed by the revenue-generating power of so-called -sin- taxesi And the products subjected to excise taxation have varied from soft drinks, fishing gear and margarine to airline tickets, telephone calls and gasoline. Taxing...