[...] Vaping has become a US$22.6 billion ($NZ33b) industry globally, up from less than $5 billion five years ago according to Euromonitor International. Although this market still pales in comparison to global cigarette sales — estimated at over US$600 billion annually — its rise has been rapid. [...] Over the past decade, tobacco interests have bought up vaping companies and invested billions into 'next-generation products'