An addiction to a drug (especially a narcotic drug)(noun)
WordNet. Princeton University. 2010.
Use "drug addiction" in a sentence
"Dr Ellis gave a clear account of his conversation with the sergeant, explaining his knowledge of Mrs Holland’s drug addiction and his reasons for concealing it at the first visit."
"But Trent had a secret sin-a drug addiction that he couldn t kick by himself."
"His mother's drug addiction during pregnancy and a placental malfunction had shut off Robby's senses as surely as a sinking ship condemns compartment after compartment to the sea by the shutting of watertight doors."