The project also doles out advice on cocaine, including 'wash your nose after each session'
A council has come under fire for giving children advice on how to pop pills, snort cocaine and smoke cannabis.
Edinburgh Council has been slatted after it produced a booklet aimed at giving pupils as young as 13 advice on drugs, drinking and sex.
The booklet, called Snapfacts and created with the city's Drug and Alcohol project, gives readers shocking tips on taking drugs including telling people to "wash your nose after each session" when taking cocaine and to "start with half a pill" when taking MDMA.
Creators have argued that the "non-judgemental" and "accurate" information in the book will help young people make informed choices and keep them safe.
But others have been left stunned by the content, which includes street names for drugs and other tips - such as "take short puffs if inhaling" when discussing cannabis.
Agnes Morrison of the Maxie Richards Foundation, an anti-drugs charity which campaigns for abstinence based treatment of drug abuse and runs a rehab centre for addicts, said: "I don't know why anybody would put out a leaflet telling teenagers the safe way of taking drugs.
"There is no safe way to take drugs. Drugs destroy people so why would you want to put together a leaflet?
"I've never come across anything like this. I know they are putting them in schools and that there is other educational information in there.
"But a lot of kids who do not know anything about drugs might read it and get the impression that there is a safe way to take drugs.
"It's like saying 'here are 10 easy ways to take drugs'. The only safe guidance against drugs is not to take them at all."
Issued to pupils at James Gillespie's High School in Edinburgh, the booklet is expected to be rolled out at other schools in the coming months.
Jeff Warden, a teacher at the school, said: "This is more ground-breaking than what we have done before.
"But listening to the students, I know they feel that sometimes we are covering ground they have covered before so we need to balance that."
Leora Wadler, 15, a pupil, added: "I think it was better than anything we normally get. But I think some things we weren't warned off as much as we should have been."
Concerned parents are able to pull their children from the sessions if they wish, while schools are also able to opt out of the initiative.
Gael Cochrane, substance misuse development officer for the Edinburgh Drug and Alcohol Project, insisted the approach was the best way to keep teenagers safe.
She said: "There is a lot of evidence that the more information young people have the less likely they are to do these things.
"Some young people will go and look things up on the internet but many will not. Without all the facts they are in a more dangerous situation.
"We completely accept there are going to be young people who don't take drugs or drinks or have sex, and we would support them in that.
"But they are a small group, as are the ones who are taking lots of drugs. It's the majority who are undecided."
Cameron Rose, Edinburgh Tory leader, said he understood there was a need to issue advice on drug abuse, but questioned the distribution of the leaflet to all youngsters.
He added: "I do understand the need to give important advice to people who are vulnerable to illegal behaviour, but for something to be distributed to all young people is perhaps not the right way.
"There are a lot of complicated issues there, but it raises questions about legitimising inappropriate behaviour.
"It seems inappropriate to be highlighting unwise behaviour."
