The Wealth of Nations by Part 5 Chapter 2 Page 245

Upon the whole, such taxes, are, perhaps, as agreeable to the three first of the four general maxims concerning taxation as any other. They offend in every respect against the fourth. Such taxes, in proportion to what they bring into the public treasury of the state, always take out or keep out of the pockets of the people more than almost any other taxes. They seem to do this in all the four different ways in which it is possible to do it. First, the levying of such taxes, even when imposed in the most judicious manner, requires a great number of custom-house and excise officers, whose salaries and perquisites are a real tax upon the people, which brings nothing into the treasury of the state. This expense, however, it must be acknowledged, is more moderate in Great Britain than in most other countries.