Both sides of New Zealand's cannabis legalisation referendum believe their campaigns will be decided by turnout, predicting a nail-biting result in the public poll.
Alongside Saturday's national election, Kiwis have been asked to vote in two referenda; on legalising euthanasia and cannabis.
A final public poll published on Thursday had the "Reeferendum" failing, with TVNZ reporting 41 per cent of Kiwis supported the measure, with 51 per cent against.
Aaron Ironside, campaign spokesman for "Say Nope To Dope", said those numbers reflected their internal polling.
"We're encouraged that our internal polling shows the No vote is ahead but these things often come down to voter turnout," he told AAP.
An unprecedented flood of Kiwis to the polls gives legalisation advocates hope.
By Wednesday more than 1.5 million New Zealanders had already cast ballots through advance voting.
In an election year where a strong majority is expected to vote either left-of-centre parties Labour and the Greens, and pro-legalisation libertarian party ACT, that could be crucial.
However, the biggest factor in the ballot has been the country's most influential politician sitting on the fence.
Prime Minister Jacinda Ardern has declined to reveal how she voted in the cannabis referendum, saying it's a matter for individual Kiwis.
Ms Ardern has been chastised for keeping her views private, but she hit back at the idea it was a cowardly position to take.
"We are putting a referendum to the public of New Zealand and saying whatever they tell us they want to do, we will implement. I consider that a courageous stance," she told AAP.
Ms Ardern has soared in popularity due to her handling of the COVID-19 crisis but rejected the idea that she should make her views known on another matter of public health.
"COVID is quite black and white ... cannabis is not," she said.
"Both prohibition or regulation, those regimes are aimed at harm minimisation.
"The judgment call becomes which do you believe is most successful ... it's just different perspectives on what gets you there.
"You will find people within a health environment who take different perspectives on that."
Mr Ironside said it was easy to see why Ms Ardern didn't want to reveal her vote.
"We can't help but feel Jacinda was concerned to align herself with a losing cause," he said.
"She had nothing to gain by coming out and her conservative base among Maori and Pasifika people would have been concerned. So there was nothing in it for her."
Leading pro-legalisation advocate and ex-prime minister Helen Clark said she understood Ms Ardern's views.
"I've been PM and people are always wanting to flush you out on everything. Sometimes you just have to say I'm keeping that to myself. I'm not going to criticise her at all," she told AAP.
Ms Clark agreed the ballot was "all dependent on turnout" and "if young people mobilise".
"Early voting gives heart. If you combine the Labour and Green vote together you've got a massive vote and the Yes votes are more likely to come from there," she said.
Referendum results are not expected for two weeks as the Electoral Commission prioritises the counting of the election.