Drug addiction is like getting very used to something and wanting more of it all the time. For example, if you eat a lot of candy and you really like it, you might want to eat more and more candy all the time. That can be like an addiction. When it comes to drugs, an addiction is when you use something like drugs which makes you feel really good and you want to keep using it.Pretty soon, you start needing it more and more and you find it hard to stop. That's an addiction.