colloquial (originally U.S.). With preceding modifying word: an addict, or (later) a habitual user of a particular substance (as alcoholic drink…

A person addicted to a narcotic drug.

colloquial. A drug-addict; a person who takes (illegal) narcotic drugs.

a regular or habitual user of (illegal) drugs, esp. one whose dependence is considered ruinous or dangerous.

A person who is addicted to drugs. Cf. druggie, n.

A person who craves narcotic drugs; a drug addict. Also in extended use.

a drug-addict.

A person affected by an addiction to a drug or other psychoactive substance. Frequently with distinguishing word denoting the addictive substance.

A person who uses drugs, esp. habitually; a drug addict. Cf. dope, n. 3b.

A hypodermic needle or injection; a drug-addict.

a person with an addiction to a drug or drugs; esp. a habitual user of an illegal drug, such as a narcotic, opiate, or hallucinogen.

a regular or habitual user of drugs for non-medicinal purposes, esp. a person who takes illegal drugs for their narcotic, stimulant, or…

slang. A drug addict. Also: a drug dealer. Now somewhat rare.

slang. A person who is addicted to drugs, esp. heroin; a habitual user of drugs. Also occasionally: a drug dealer.

A drug-addict.

slang. A drug user who administers drugs hypodermically.

U.S. slang. A drug-addict who takes drugs by injection.

A drug addict.

A drug addict.

One who sells, uses, or is addicted to, drugs.

A drug addict. Now rare.

a person who takes pills (esp. barbiturates, amphetamines, etc.) to excess; a person addicted to pills.

A person who experiments with or habitually uses illegal drugs; a drug-addict.

One who ‘freaks out’ (freak, v. 3); a drug addict (see also quots.).

A person who uses or deals in narcotic drugs. See also druggie, n., drug dealer n. at drug, n.1 compounds 1b.