Smoking has a detrimental impact on overall fitness and health by compromising lung function and reducing oxygen delivery to tissues. It contributes to the development of numerous serious conditions, including chronic obstructive pulmonary disease (COPD), heart disease, and several types of cancer. Smoking also affects physical performance by diminishing cardiovascular endurance and impairing recovery. Furthermore, the habit can lead to decreased motivation to exercise and maintain a healthy lifestyle, exacerbating health issues over time.