"Physical fitness is not only one of the most important keys to a healthy body, it is the basis of dynamic and creative intellectual activity. The relationship between the soundness of the body and the activities of the mind is subtle and complex. Much is not yet understood. But we do know what the Greeks knew: that intellegence and skill can only function at the peak of their capacity when the body is healthy and strong." by John F. Kennedy

This quote means that if you do drugs of any kind, your body will not be healthy. Your body will not be healthy because youkill many brain cells by allowing these drugs in you. It is saying that not many people know that their body will be damaged by doing drugs either in the future or in your present. It also states that if you accept drugs when they offer you some, you not only damage your body but you mentally, it messes you up. You have to do the right thing and say no.