It is defined as a compulsive need to use drugs to function normally. A person usually encounters the addictive agent casually but soon becomes so dependent on it that he/she require it to function. Drug addicts most often want to quit the habit but find it difficult to do so on their own. For this reason, there are a number of de-addiction clinics – for example AA (alcoholics anonymous), etc. Some research shows that an addict’s brain reacts to addictive agents differently when compared to those who are not addicted, leading to the idea that addiction might be a genetically acquired trait. The use of drugs causes both instant and long term damage to the body and mind. For example, they cause hallucinations, lack of inhibition, depression, euphoria, excess hunger, etc. immediately upon ingestion and loss of memory, lack in brain function, damage to various organs in the body, rotting of the teeth and even cancer in the long run.