Kuranui College principal Geoff Shepherd is urging the community to work together to encourage all retail outlets to stop selling harmful synthetic cannabinoid substances.
His urging comes as the Government works to fast-track the Psychoactive Substances Bill into law by July.
"The national media has recently highlighted the potential for our young people to be seriously affected by synthetic cannabinoid substances which are available for sale in a number of our local dairies," Mr Shepherd said.
"It is very clear from the research that these products can cause serious and possibly lasting side effects such as hysteria, aggression, paranoia, depression and memory loss.
"A quick visit to the dairies in the Southern Wairarapa showed that at least two are selling synthetic cannabis and although it is restricted for sale to people 18 years and over, younger people can certainly obtain it if they want to.