More than $350,000 was spent on the New South Wales Government's widely criticised Stoner Sloth campaign that was designed to deter teenagers from smoking cannabis, documents have revealed.

Freedom of information documents obtained by the Greens revealed the costs as the State Government held a roundtable meeting to tackle the state's drug problem.

The Stoner Sloth online advertisements, which featured human-sized sloths struggling with basic activities, cost $351,790 and involved 265 hours of work by public servants.

Advertising agency Saatchi & Saatchi was paid $36,386.

The campaign, which ran online with the slogan: "You're worse on weed", became the top trending topic on Twitter Australia on the weekend of its launch, and was widely ridiculed online.

At the time, the Department of Premier and Cabinet said the campaign was designed to appeal to, and be shareable among, teenagers who could be vulnerable to cannabis.

However, Premier Mike Baird used Twitter to say he was "not sure where NSW Gov's ad guys found Chewbacca's siblings, but those videos are ... Quite something".

Greens MP Mehreen Faruqi said a lot of money was wasted on a campaign "that is really juvenile and has no educational value".

"The $350,000 and the public service time would have been much better spent in actually doing an educational campaign and talking to the community, having a grown-up conversation about the risks of drug use, or actually putting it into a campaign around health," Dr Faruqi said.

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Families 'key' to drug prevention strategies

The Government said it was continuing to focus on the need for early intervention for drug users with a roundtable of experts to discuss the growing use of illicit substances.

Experts from public health, the NSW Drug Squad and non-government support services, including the Salvation Army and the Tedd Noffs Foundation, discussed how to help users get early treatment.

Assistant Health Minister Pru Goward said the participants examined ways to "strengthen families to be part of that early intervention".

"Too often the family's only response comes when the child is in prison, when the child has presented to emergency or when the child has attacked a family member, and yet they know for some time before that their child is struggling," Ms Goward said.

"We need to strengthen their capacity to be part of early intervention."

Ms Goward said she and the Deputy Premier, Troy Grant, had committed to coming back to the experts in April with concrete proposals on how to achieve those aims.

However they all but ruled out policy options that have recently been the subject of public debate, including scrapping the use of sniffer dogs and introducing pill-testing at music festivals.

"I respect the experts ... but I have said repeatedly and I'll say it again - pill-testing may tell you what's in that pill or that drug, but it cannot tell you if it's going to kill you or harm you," Mr Grant said.

"The New South Wales Government is not going to sanction a regime that simply provides a quality assurance testing mechanism for drug dealers."