Cannabis use is continuing to decline among young teenagers, even as it rises among adults.
Research published in the New Zealand Medical Journal reveals that in 2018, 14 percent of Year Ten students had used the drug - down from 19 percent in 2012.
Smoking and alcohol use have continued to drop in this age group.
Jude Ball is a research fellow at the University of Otago.
She speaks to Susie Ferguson.
