Dependence

This term is often used to mean the same thing as addiction. It can be thought of in two ways: (1) psychological feelings of discomfort when the drug is not available (psychological dependence), or (2) a state where the body requires the regular use of alcohol or other drugs in order to continue to function (physical dependence). If a person develops physical dependence and then stops taking the drug, he/she is likely to experience withdrawal symptoms.