The long-term effects of smoking on physical fitness are detrimental. Smokers often experience a decrease in lung capacity and cardiovascular endurance, making physical exertion more challenging. They may face chronic respiratory issues and reduced oxygen supply, impairing overall exercise performance. Over time, smoking can lead to weight gain as metabolism slows and muscle mass decreases, further compounding health issues. It also increases the risk of numerous illnesses, including heart disease and cancer, which significantly affect physical fitness levels. Overall, smoking has a profound negative impact on an individual's fitness journey.