The Wealth of Nations by Part 4 Chapter 7 Page 246

assured, for the chief, that is, the first clerk of a factory, to order a peasant to plough up a rich field of poppies and sow it with rice or some other grain. The pretence was, to prevent a scarcity of provisions; but the real reason, to give the chief an opportunity of selling at a better price a large quantity of opium, which he happened then to have upon hand. Upon other occasions the order has been reversed; and a rich field of rice or other grain has been ploughed up, in order to make room for a plantation of poppies; when the chief foresaw that extraordinary profit was likely to be made by opium.

The servants of the company have upon several occasions attempted to establish in their own favour the monopoly of some of the most important branches, not only of the foreign, but of the inland trade of the country.