Legalising cannabis in some parts of the US didn't encourage young people to use the drug, according to new research.
A study of more than 1.4 million high school students in America found cannabis use among youth fell after legalisation.
A researcher here says we could see similar results if New Zealand law is changed.
Kiwis are set to vote on the legalisation of cannabis in a referendum next year alongside the general election.
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