New World and Four Square stores in Auckland have axed their 5c charge on plastic bags.

Licensing tobacco retailers and turning cigarette packs into plain packages bearing only health warnings is among five new proposals to reduce smoking.

A Wellington supermarket is forced to axe a compulsory plastic bag charge it introduced only four weeks ago.

The number of plastic bags used by NZ shoppers has been slashed by 157 million over five years - almost a quarter of the original total.

Warning for retailers as more than 100 weapons are seized.