Police and the Ministry of Health are moving in tandem in response to rising misuse of nitrous oxide — also known as nangs, laughing gas, or nos — particularly by people behind the wheel.

Assistant Commissioner of Road Policing and District Support Tusha Penny said any substance that affects judgement, coordination or consciousness has clear implications on the road, and police are now seeing nitrous oxide show up in serious crashes, including some where people have died. Police did not release figures today but said they are dealing with a growing number of incidents involving drivers inhaling the gas.

Police say calls from the public reporting nitrous oxide use in vehicles have led to interventions that have “helped prevent harm and likely saved lives.”

Alongside roadside enforcement, Police are turning to supply. The sale of nitrous oxide for recreational use is illegal under the Psychoactive Substances Act. Officers will begin sending letters to retailers in areas where misuse is a known issue, reminding them of their obligations. Penny said Police will take a graduated approach — engagement, education and encouragement first — and will “step up to enforcement if we need to,” while continuing to work with partner agencies.

The Ministry of Health’s Chief Medical Officer, Dr Joe Bourne, said reports of nitrous oxide misuse linked to driving are a particular concern. He warned the gas can rapidly displace oxygen in the lungs and bloodstream, causing dizziness, confusion and blackouts. Mixing nitrous oxide with alcohol or other drugs can have unpredictable effects and increase the risk of harm.

Heavy, frequent or chronic use can also lead to longer-term problems, Bourne said, including nerve damage that may cause weakness, numbness and ongoing issues with movement or coordination. He encouraged anyone who has used nitrous oxide and is worried about their health to contact their healthcare provider.

The Ministry will work with Health New Zealand to raise awareness of the physical and mental health harms from recreational use. People seeking support can contact the Alcohol Drug Helpline on 0800 787 797 or text 8681.