If you do something that gives you pleasure, the brain is wired in such a way that you will probably want to do it again. All drugs that are addicting can activate and affect the brain's pleasure circuit. Addiction is a disease that affects your brain and behavior. When you become addicted to alcohol or drugs, your brain actually changes in certain ways. Someone who is addicted uses drugs without regard to the consequences, such as problems with health, money, relationships and performance at work or at school.
People can become addicted to illegal drugs and to drugs that doctors prescribe.
People can also become addicted to things they may not think of as drugs, such as alcohol and cigarettes. When prescription drugs are taken the right way, there is much less chance of becoming addicted to them. You have a problem with drugs or alcohol if you continue to use them even when they cause problems with your health, money, work or school, or with your relationships. It may take a number of attempts before you can remain free of drugs or alcohol. Treatment can include counseling, medication, or both.