Voters will this year get a say on whether New Zealand should legalise cannabis for personal use.
Advocates argue legalisation will take the product out of the hands of criminals, and ensure that users are not exposed to more harmful drugs or other illicit activities.
But in Canada, where cannabis has been legal for more than a year now, people are still predominately turning to the black market for their high.
In part four of our series this week looking at issues that'll make headlines in 2020 Kim Savage spoke to Michael Armstrong, associate professor in the Goodman School of Business at Brock University in Canada.
He's been researching the business side of Canada's decision to legalise cannabis.