Party breakdown

Green Party supporters were most in favour, with 84 percent saying they would vote yes. National supporters were least likely to support it, with just 33 percent support.

ACT: 49 percent yes/ 26 percent no

Green: 84 percent / 14 percent

Labour: 63 percent / 17 percent

National: 33 percent / 48 percent

NZ First: 56 percent / 26 percent

Age breakdown

Surprisingly, more people between 25-34 would vote yes than people aged between 18-24. At the other end of the age scale, more people over 75 would vote yes than people between 65-74.

18 - 24 years: 68 percent agree

25 - 34 years: 75 percent agree

33 - 44 years: 72 percent agree

45 - 54 years: 58 percent agree

55 - 64 years: 58 percent agree

65 - 74 years: 30 percent agree

75yrs or over: 37 percent agree

New Zealand's largest licensed medicinal cannabis company, Helius Therapeutics, which commissioned the poll, says it will be encouraging for the many New Zealanders who support the liberalisation of recreational cannabis use.

"From this survey, it appears a majority of New Zealanders will vote yes at the 2020 referendum," says executive director Paul Manning.

"It's also encouraging for us to see an overwhelming 81 percent of Kiwis continue to support the legal production of medicines from cannabis.

"This very strong support for medicinal use reflects other poll results we've seen calling for widespread access to cannabis for therapeutic purposes."

The poll had a maximum margin of error of +/- 3.1 percent at a 95 percent confidence level. But Family First national director Bob McCoskrie, who opposes the 'yes' vote, says the poll is "simply not robust or reliable".

Newshub.