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"I was responding to concerns that there were two students in the same cubicle potentially vaping. The photo shows me checking from a distance the number of feet in the cubicle.
"As vaping products are R18 only, potentially highly addictive, and prohibited at schools, it is important that we respond to these situations promptly and strongly.
"It is also important to note that we would never jeopardise someone's privacy and dignity in the toilets."
It comes as some schools have resorted to locking toilet blocks in an effort to curb the trend. Principals say vaping is more socially acceptable than smoking, as well as being easy to hide and vaping gear being easy to buy. There is also less research into the risks.
The number of Kiwi teens trying vaping has skyrocketed in recent years, despite new legislation making e-cigarettes R18 for purchase.
Almost 40 per cent of 15- to 17-year-olds had tried an e-cigarette at least once in the Ministry of Health's 2019/20 NZ Health Survey - up from 25 per cent a year earlier.
The number of those who used an e-cigarette at least monthly more than doubled, from 3.4 per cent to 8.7 per cent.
However "current smokers" in the age group fell from 3.8 per cent to 3.3 per cent.