Drug addiction is a condition where one is unable to control a certain prescribed medication or a legal/illegal drug despite the harm that they cause. The risks and effects of the substances may vary from one drug to another. These substances/drugs include alcohol, nicotine, marijuana, and others. The prolonged use of the drugs makes one unable to do without them; hence an attempt to withdraw may cause withdrawal symptoms. Treatment can be done through a doctor, organized groups, family, or friends.