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To understand the damage done to chimneys by smoke, fire, and creosote, take science courses—particularly chemistry classes. In chemistry class, you'll learn more about the chemical reactions from fireplaces, such as carbon monoxide, that can cause illness and death if not contained. You may also be working with some chemicals to break down creosote glaze. With a clear understanding of the chemistry involved, you can easily explain problems to customers and stress the importance of chimney sweeping and repair.