Drug addiction is a dependence on an illegal drug or medication. Many people confuse it with drug dependency, which is when a person needs a drug to function normally. The difference between drug addiction and drug dependence is drug dependence is when a person needs a drug to function normally, like some blood pressure medications can cause a physical dependence, but the person is not addicted to the drug. A person can have a physical dependence, but not be addicted. Many scientist believe that drug addiction is a brain disease, and this disease causes compulsive drug-seeking and use, despite the consequences that person may suffer.

Taking a drug causes surges in your brain of dopamine. Dopamine is a neurotransmitter, which is a chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and transfers that impulse to another nerve fiber or some other structure. A “messenger of the brain.” Dopamine is in the mood-changing category of neurotransmitters. When dopamine surges in your brain, it causes immense pleasure. Your brain remembers this and wants more, and you are addicted. Dopamine is the reason some people over eat and are obese, and people are addicted to alcohol and drugs.

Biological history of addiction, abuse or other scaring experiences in early childhood, mental disorders (such as depression) and early use of a drug are the reason some people get addicted, while others don’t. Many people start using drugs out of curiosity, to have a good time, their friends do it, to improve