Kronic-style drugs are expected back on the shelves under the new legal high law being crafted by Associate Health Minister Peter Dunne.
Experts say the law will create one of the world's first open and regulated recreational drug markets with synthetic cannabis making a return.
The first legal highs will be offered for sale in 2014, based on estimates in papers released by health officials.
The new regime, announced by Mr Dunne last week, aims to end the uncontrolled legal high industry which is estimated to have made $250 million in 10 years. The unregulated market has seen drugs sold legally with effects mimicking illegal substances like P, cannabis and Ecstasy.
In the law Mr Dunne aims to have ready by August next year, legal high manufacturers will have to pay to have their substance proved "low risk". His office acknowledged it would create a legal drug market.