The claim by New Zealand's main tobacco companies that plain packaging will not reduce the prevalence of smoking has been dismissed by a researcher who tested the concept.
The Government has agreed in principle to impose plain packaging - with large health warnings - on the tobacco industry, subject to a public consultation process.
It is part of the plan to make New Zealand virtually smokefree by 2025 and would follow the introduction of plain packaging law in Australia, the first country to adopt this tobacco rule.
British American Tobacco, Philip Morris and Imperial Tobacco have all said plain packaging won't work.
"We do not expect plain packaging to reduce smoking rates," said BAT New Zealand's head of corporate and regulatory affairs, Susan Jones. "Plain packaging is about the fact there's no proof this will work."