What is a common early effect of smoking on physical health?

The choice of reduced physical fitness is correct because smoking adversely affects the body’s ability to utilize oxygen effectively, which is crucial for physical performance. When an individual smokes, carbon monoxide from tobacco binds to hemoglobin in the blood more readily than oxygen does. This reduces the amount of oxygen transported throughout the body, leading to a decreased capacity for aerobic endurance activities. Furthermore, smoking can lead to increased fatigue, making it more difficult to engage in physical activities over time.

Additionally, smoking damages the lung tissue and diminishes overall lung function, which negatively impacts stamina and performance in physical activities. Long-term smokers often experience diminished respiratory efficiency, contributing to an overall decline in physical fitness levels. Therefore, reduced physical fitness is one of the critical early effects of smoking that can significantly affect a person's ability to engage in and enjoy physical activities.