Smoking weed just once can change the teenage brain

Getting high on weed just once may change the structure and volume of the teenage brain, although it’s not clear what affect this may have on behaviour, or why some people are more vulnerable than others, according to a new study.

The latest research, from Swinburne University in Melbourne and published in the Journal of Neuroscience, is the first to look at the consequences of limited cannabis use on humans.

Previous studies have shown heavier cannabis use changes the brain.

The study involved 46 14-year-olds from Ireland, England, France and Germany who had used cannabis just once or twice.

Swinburne University’s Dr Catherine Orr, an author of the study, told Hack the study compared the grey matter volume of the participants’ brains with a group of people who had never used cannabis.

People in the study who had been exposed to cannabis had a larger amount of grey matter in parts of the brain

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