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Wiktionary
drug addiction

n. dependency on drug, especially which are illegal or improperly procured.

WordNet
drug addiction

n. an addiction to a drug (especially a narcotic drug) [syn: white plague]

Usage examples of "drug addiction".

So look what my drug addiction, my years of using drugs, has meant, finally.

Older sins -- alcoholism and drug addiction and compulsive gambling -- cannot compete.

The problem of drug addiction was not limited to the Livin' Sludge, and the problem of physical impairment not limited to Tinka's blindness.

Senta, seated on the sofa, was silent for so long that Rob was afraid of some new attack from her drug addiction.

As we discussed earlier, drug addiction is not a legal defense to a crime.

So here's me gettin' one monthly check no bigger than a brush-rabbit turd, hardly enough to buy me the makin's of a good long beer piss, while Barney Colter's worthless lazy donkey-wit son, who never worked a day in his useless life, he collects twice what I get 'cause the gov'ment says his drug addiction's left him emotionally disabled.