"Tobacco Leaves: Being a Book of Facts for Smokers" by William Augustine Brennan is a nonfiction manual likely written in the early 20th century. This work aims to provide practical information specifically for tobacco users, filling a gap in literature that often focuses more on the cultural or negating aspects of tobacco. The book addresses various aspects of tobacco, ranging from its cultivation and production to its chemical properties and effects on health. At the start of the book, the author sets the context by explaining the intended readership: daily tobacco users who may lack knowledge about the plant's history, cultivation, and impacts. Brennan outlines the book's goals to educate smokers about the tobacco plant, its uses, and its effects, making it clear that the writer does not impose personal judgments on the use of tobacco. He highlights the historical background of tobacco, tracing its journey from indigenous use in the Americas to its spread in Europe, and introduces the book's structure, which promises comprehensive coverage of tobacco's cultivation, production, varieties, and health considerations.