the state of being enslaved to a habit or practice or to something that is psychologically or physically habit-forming, as narcotics, to such an extent that its cessation causes severe trauma.

noun

bag * , bent , craving , dependence , enslavement , fixation , hang-up * , hook , inclination , jones , kick * , monkey * , monkey on back , obsession , shot * , sweet tooth * , thing *notes:addiction is mainly physical while dependency is mostly psychological , compulsion , fetish , surrender