It is important to define what drug abuse is and when the line between abuse and addiction is crossed. Drug abuse is the consumption of any drugs that are harmful to the individual in a physiological or psychological way. Though the first intake of drugs is voluntary, later a person can lose control over substances consumption and become addicted. Many people consider that drug addicts lack stamina and control over their desires but in reality, the mechanism is far more complicated as repetitive consumption of drugs changes brain reactions which leads to addiction appearance (Addiction is a Chronic Disease, 2010).