This PowerPoint presentation delves into the anatomy and physiology of the respiratory system, detailing the structures and functions involved in breathing and gas exchange. It examines the detrimental effects of smoking and e-cigarette vapor inhalation on lung function, highlighting how these substances disrupt the delicate processes within the lungs, including gas exchange. The presentation further explores specific diseases associated with smoking, encompassing both pulmonary conditions like COPD, lung cancer, asthma, and bronchiolitis obliterans, and cardiovascular diseases such as atherosclerosis and coronary heart disease. It also addresses the growing concerns surrounding e-cigarettes, discussing their composition, potential health risks, and the ongoing debate about their safety compared to traditional cigarettes. The presentation references key scientific studies and provides a comprehensive overview of the topic.