Drug Dependence

Physical dependence refers to a state resulting from habitual use of a drug, where negative physical withdrawal symptoms result from abrupt discontinuation. From the point of view of the dependent person, "dependence is duress," argues addiction researcher Griffith Edwards.
See more at Wikipedia.org...

Drug 1. a chemical substance that affects the processes of the mind or body. 2. any chemical compound used in the diagnosis, treatment, or [more]Drug dependence - Community and Resources