E-cigarettes will be banned from sale to minors in NSW, including "e-juice" vaporisers with fruit flavours, Health Minister Jillian Skinner will pledge on Sunday.

One in seven smokers had used e-cigarettes in the past 12 months, with the biggest uptake among 18 to 24-year-olds (27 per cent), the latest household survey by the Australian Institute of Health and Welfare found.

Despite liquid nicotine being banned for sale in Australia, the delivery devices are legal and "vaping" has boomed. E-cigarettes in the shape of cigarettes, lipsticks and pens have become readily available in convenience stores and over the internet.

But Cancer Council Australia has argued even non-nicotine vapours, including the fruit and chocolate flavours marketed to teenagers, pose a health risk because they are sucked straight into the lungs.

There is concern at a rise in poisonings caused by young children ingesting liquid from brightly coloured cartridges that do not have child safety caps.