the effect  of addiction: of the family homeostasis
Ironically, it is the brain's ability to be so adaptive that contributes to the formation of addiction. Addiction causes changes to the brain in at least four fundamental ways: 1. Addiction causes changes to the brain's natural balance (homeostasis).
Each person's normal balance is individually determined. Drugs of abuse and activity addictions lead to changes in this normal balance. Chronic over-stimulation of the brain (like that which occurs in addiction) interferes with the maintenance of this balance (homeostasis).