The Government has been urged to consider restricting sales of nicotine electronic cigarettes to pharmacies, in a blog to be published today by public health experts.
But an opponent of medical-style controls says doing that would impede access to a device that has huge potential to reduce smoking harm.
Battery-powered e-cigarettes produce a vapour containing nicotine, the chemical craved by smokers. Nicotine inhalation carries some health risks, but these are far less than from inhaling the many harmful components of tobacco smoke.
Their use has surged internationally. Some use so-called "vaping" to quit tobacco, others to help them smoke less. Comprehensive usage data is not collected in New Zealand but a survey by the Health Promotion Agency found the proportion of adolescents who had used an e-cigarette had nearly tripled in two years, to 20 per cent last year.
This has reinforced concerns that e-cigarettes may be a gateway for youth to nicotine addiction and smoking.