https://www.insurancebusinessmag.com/au/news/life-insurance/vapingrelated-hospitalisations-surge-in-australia--private-healthcare-australia-472687.aspx

The truth of vaping problems and risks has been described but the NZ government has downplayed them. Sadly, it is a little like tobacco, until people are hospitalised or die due to a product which makes a lot of money the issue and associated facts are ignored. 

As this Australian article published last month describes, this is just showing up private insurance cases, a mere fraction of what happens overall there.

Also, as this is describing what has been occurring in Australia , which has had much tighter controls than NZ, and a considerably lower per capita vaping rate, the reality in NZ is likely to be significantly worse.