The undercover police car parked outside Dunedin's newly-opened Whakamana Cannabis Museum was just a co-incidence, insists curator Abe Gray.

And if the officers were wondering what was inside the country's newest museum, a helpful pamphlet had been stuck under the vehicle's window wipers just in case.

"We welcome everybody," Gray said.

HAMISH McNEILLY/STUFF Abe Gray, curator of Dunedin's Whakamana Cannabis Museum.

The free museum opened over Easter to capitalise on the thousands of people in the city for the three Ed Sheeran concerts.

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It is the only dedicated cannabis museum in the country, and one of five around the world.

HAMISH McNEILLY/STUFF Dunedin's Whakamana Cannabis Museum is in new premises in the city centre.

The museum moved from an old villa in the suburb of Caversham, and its new city-base meant it could better promote "the facts around cannabis".

"We aren't going to get reform until we educate the public enough to be a wee bit more demanding of the politicans."

The museum's content was factual and academic, but tried to be entertaining, Gray said.

It includes interactive displays on hemp as a product, medicinal cannabis, cannabis delivery methods.

Perhaps a highlight is the funiculator, invented by a former Dunedin student, which delivers beer, cannabis and nitrous oxide "simultaneously".

While the museum sold cannabis-related paraphernalia, there was no cannabis for sale, Gray said.

"But as soon as it is legal we will."

If cannabis laws are relaxed, the new museum is in the area where psychoactive substances can be sold in Dunedin.

The museum also includes a cafe, High Tide, which sells coffees for $4.20 – a nod to cannabis culture.

And out the back is a members-only VIP room, complete with video games and table tennis, where members can join for – you guessed it – $4.20 a week.

Dozens of people had already joined, Gray said.

There is also a plan to convert an upper floor into a backpackers.