**How does smoking affect physical performance?**
Smoking adversely impacts physical performance by impairing lung function and reducing oxygen intake. The presence of carbon monoxide in cigarette smoke competes with oxygen, diminishing the oxygen availability crucial for endurance during physical activities. Moreover, smoking can lead to decreased circulation, impacting stamina and recovery. Over time, smokers may experience reduced exercise capacity and higher susceptibility to injury. Quitting smoking can significantly enhance overall fitness levels, respiratory health, and athletic performance.