Meaning of the word "gateway drug" in English

What does "gateway drug" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

gateway drug

US /ˈɡeɪtweɪ drʌɡ/
UK /ˈɡeɪtweɪ drʌɡ/
"gateway drug" picture

Noun

1.

a drug whose use is thought to lead to the use of more dangerous drugs (such as heroin or cocaine)

Example:
Marijuana is often considered a gateway drug by some.
The theory of gateway drugs suggests a progression from less harmful to more harmful substances.
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