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A drug or other ingested substance, such as alcohol or marijuana, whose habitual use is thought to lead to the use of very addictive and dangerous drugs such as cocaine and heroin.
(Recreational Drugs) a recreational drug such as cannabis, the use of which is believed by some to encourage the user to try stronger drugs
any mood-altering drug, as a stimulant or tranquilizer, that does not cause physical dependence but may lead to the use of addictive drugs, as heroin.
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|Noun||1.||gateway drug - a habit-forming drug that is not addictive but its use may lead to the use of other addictive drugs; "one college athlete recently called beer a gateway drug for young people"|