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Vaping is touted as a lesser of two evils for smokers trying to quit - but a Kiwi scientist says there's much about e-cigarettes' long-term effects that we still don't know.

The University of Auckland's Dr Kelly Burrowes has now launched the most advanced study of its kind in the world, using human trials and state-of-the-art 3D computer models to get a precise look at what vaping does to our lungs. Worldwide sales of e-cigarettes have boomed around the globe over the past decade, and today an estimated three in 100 Kiwis use them at least once a day.