This document provides an overview of smoking cessation. It begins with an introduction discussing the negative health impacts of smoking and statistics on smoking rates. It then covers the chemical components in cigarettes and negative effects of smoking on various parts of the body. Benefits of smoking cessation are outlined. The document also summarizes several research studies on smoking cessation methods and their effectiveness, including enhanced motivational interviewing versus brief advice, nicotine replacement therapy, and a randomized trial of nicotine replacement therapy patches in pregnancy. Barriers to smoking cessation and electronic cigarettes are also discussed.