Alcohol doesn't enhance your athletic performance. In fact, it may make it worse. Even after only a drink or two, your eye-hand coordination, reflexes, and sense of balance are affected.

In addition to being controlled substances, narcotics have significant negative physical effects on the body. People under the influence of marijuana perform poorly in virtually every sort of mental and physical task, especially athletics.

Smoking reduces the respiratory system's ability to provide oxygen to working muscles. Smoking forces the heart and lungs to work harder and increases your blood pressure.