monkey on one's back

Noun

 * 1)  An addiction, especially to narcotic drugs.
 * 2)  A state of persistent distress or worry or the cause of such a state.
 * 1)  A state of persistent distress or worry or the cause of such a state.
 * 1)  A state of persistent distress or worry or the cause of such a state.

Synonyms

 * Chinaman on one's back

Antonyms

 * monkey off one's back