Four more types of synthetic cannabis substances have been banned, and products containing them must be taken off the shelves tomorrow.
Since Parliament passed a Bill last August to tackle the trade in so-called 'legal highs', 28 substances have been temporarily banned, resulting in 50 products being removed from sale.
The Temporary Class Drug Notices are a holding measure until permanent legislation can de developed this year to force manufacturers to prove products are safe before they are put on sale.
The latest substances to be banned are the chemicals CB-13, MAM-2201, AKB48 and XLR11.
"I am informed that all these substances have recently been identified in powders investigated by ESR," Associate Health Minister Peter Dunne said.
"CB-13 was also identified separately by ESR in a synthetic cannabis product called Tai High."
Anyone found illegally trading products containing these chemicals could face prosecution when the ban comes into force tomorrow.
"My advice is don't become involved in the supply of any products containing synthetic cannabis substances and people should also think twice before consuming products with so little known about their potential effects," Dunne said.
Any product containing a banned substance cannot be sold either from retail outlets or over the internet.