Chemical dependency

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...

Chemical dependency n. A physical and psychological habituation to a mood- or mind-altering drug, such as alcohol or cocaine. [more]Chemical dependency - Community and Resources