A ban on all advertising of cannabis products, no online sales - and a minimum purchase age of 20.

Those are key restrictions in a draft cannabis law released this week ahead of next year's referendum.

Justice Minister Andrew Little says it's important voters are well informed before the 2020 General Election - and can participate in the referendum process.

The ballot will ask a simple Yes/No question.

National's Drug Reform spokesperson Paula Bennett says it's well-intentioned, but not delivering what it needs to, and there are too many questions for voters.

Is this just the beginning of the mudslinging and debate ahead of the contentious vote?

One News political reporter Katie Bradford joined The Weekend Collective to discuss what this week's announcement means and what will come next.

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