Cocaine being delivered quicker than pizza. GHB getting more popular. Emergency treatment for LSD. And Australians drunk as usual.

That's what the data from the 2018 Global Drug Survey (GDS) revealed.

More than 130,00 people from over 40 countries participated, with an average age of mid-20s.

Here's what the survey found.

Cocaine competition is driving down delivery times

The GDS showed that, on average, globally, pizza took longer to deliver than cocaine.

Thirty per cent of people who had cocaine delivered said it arrived in less than 30 minutes.

That's compared to 16 per cent who had pizza delivered in less than half an hour.

"The worry about having a potent drug delivered quickly is that it may lead to an escalation of people's use," GDS founder Professor Adam Winstock said.

"Cocaine is a commodity like all drugs, and people selling it will be looking to diminish any barrier to selling their products.

"They're going to want to beat the competition and, at the moment, competition is based around quality and speed of delivery."

But in Australia pizza delivery is still quicker than cocaine.

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Whatsapp Comparison of national average cocaine prices.

GHB 'seeping out'

The survey showed GHB - a depressant also known as 'Fantasy' - was the most likely drug to land women in hospital.

"The rate of passing out for men is one in six, for women it's one in four," Professor Winstock said.

The risk it has for women passing out is huge and the implications for that in terms of being vulnerable to sexual assault are huge.

Professor Winstock said GHB well known in the gay community, but heterosexual people were beginning to dabble in it recreationally.

"With huge risks of passing out unconscious," he said.

"Of all the drugs you don't want seeping out - it's GHB."

Australia tops emergency treatment for LSD

Australia had the highest number of emergency department presentations for LSD.

In the GDS, more than 10,000 reported taking LSD in 2017, with about 100 of them reporting they sought emergency medical treatment (EMT).

While it was a fairly small number, it was still worrying, Professor Winstock said.

"There's the possibility that people assume they take LSD but maybe its not, maybe it's a more potent hallucinogen like NBOMe," he said.

It was also concerning because LSD typically has a low frequency for use.

Report co-author Dr Monica Barratt from the National Drug and Alcohol Research Centre said LSD was typically used two to three times a year.

"So if even two per cent of people are saying they've sought emergency medical treatment for a drug that's occasional, that's something to consider," she said.

Australia was ranked second in the world for emergency medical treatment related to methamphetamine (after the US) and MDMA (after Scotland).

Australians buy less on the dark web than Europeans

The GDS found Australians don't use the dark web as much as Europeans.

It showed around 17 per cent of the 1,000 Aussies that took part reported using drugs obtained through dark web.

That's compared to 50 per cent of respondents in Finland, and 25 per cent in the UK.

The most common drugs bought on the dark net include MDMA, LSD and cannabis.

"Buyers were typically younger and they were typically male, compared to other participants that used drugs in the last 12 months," Dr Barratt said.

The authors said that although dark web purchases in Australia increased from last year, that was because this years sample was a lot younger.

Would health warnings make you drink less?

For the first time the GDS examined how people would respond to health warnings on alcohol bottles.

It found a majority believe health messages around disease and cancer, calorie intake, the benefits of taking a break from drinking, and alcohol-related violence.

But a majority also said health warnings wouldn't make them drink less.

Professor Adam Winstock said it wasn't about getting everyone to drink less.

"You want people drinking too much to drink less and about a third of people said these [health] messages would make them think about drinking less," he said.

"On a population level you might get a huge gain for very little work.

"For some it might be just enough to get them to think about drinking less and maybe actually reducing their drinking."

Australia ranked third in the world for the most presentations to emergency departments for alcohol, after Scotland and Norway.