Fears social media is exposing more young people to drug use.
The latest Drug Trends Survey reveals apps like Facebook and Snapchat are used to arrange sales, and drugs are also marketed on gaming apps.
It finds there's been an overall rise in the use of social media purchasing for all drug types, particularly cannabis and MDMA.
SHORE and Whariki Research Centre Professor Chris Wilkins told Mike Hosking the market's moved online.
He says there's an algorithm phishing for engagement, which means there's a cross section of young people who are exposed.
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