"There's no money these days in selling anything smaller than ounces," he says.

"There's your tinnie shops around and that, but they're in decline. And that's because the prices of marijuana are going through the roof due to the fact that there's less growers out there due to other drugs and more crime."

As a result, Jay says people are getting ripped off by the cannabis black market. There's no standardisation of tinnie sizes and they keep shrinking.

"This is what you're getting left with. A couple of buds and a bit of f**king shakey shit," he says, showing Gower the results.

"The prices stayed the same. It's the size that's dropped down. This is the state of cannabis these days and it's an ugly state of affairs. This is what I'm out to try to change. I'm changing this for the better of New Zealand."