soft drug
US /ˌsɑft ˈdrʌɡ/
UK /ˌsɑft ˈdrʌɡ/

1.
a drug considered to be not harmful and not habit-forming, such as cannabis
:
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Cannabis is often classified as a soft drug.
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The debate over legalizing soft drugs continues in many countries.
a drug considered to be not harmful and not habit-forming, such as cannabis