A further four synthetic cannabis substances have been banned from commercial sale.
Associate Health Minister Peter Dunne has announced that chemicals CB-13, MAM-2201, AKB48 and XLR11 have been introduced to the Temporary Class Drug Notices, under the Misuse of Drugs Act.
CB-13 was identified in a synthetic cannabis product called Tai High.
Cameron Rd tobacco store Puff 'n Stuff had previously stocked Tai High but it was not popular, proprietor Mike Lawrence said.
The store instead stocked a product called Rock Solid, hash made from beer which contained no synthetic cannabinoids and was popular with customers.
"The people that were buying this legal stuff, I'd say are between 26 and 60.
"There are no kids buying this and getting stupid about it."
Mr Lawrence said demand for herbal highs had dwindled considerably since the original ban, which removed more than 50 synthetic cannabis products from the market in August last year.
But since the announcement yesterday, demand for herbal highs in general had increased. "We've sold more in the last hour than we have in the last month," Mr Lawrence said in the afternoon.
Usually the store would have about five people a week asking for herbal highs, he said.
"We have this older guy who comes in on a Thursday, buys a packet and has a whole week of having 'calm and relax' as he calls it, with his wife."
Mr Lawrence said the man enjoyed the herbal highs because he was in a line of work that required regular drug testing but he said he would probably go back to alcohol now.
At Switched On Gardener, manager Fleur Wait said they did not stock any of the offending synthetic cannabinoids.
Instead they offered natural herbal highs which were increasingly popular.
The extra bans were a good thing, she said.
The store sold Cahoots, Chill, Ignite and Vortex as 100 per cent natural herbal highs and another product named Electrum potpourri - synthetic free.
A former stockist of Tai Hai and other synthetic cannabinoids said they'd had zero demand for the product since the last ban and no longer stocked any.
A woman at Essential Dairy said they also stopped stocking the product, but other stockists refused to comment.
Mr Dunne said it could be difficult to know if a product contained a banned substance but anyone found to be illegally trading products containing the chemicals faced prosecution.
"People should also think twice before consuming products with so little known about their potential effects."
Cannabanoid is any of a group of related compounds that include cannabinol and the active constituents of cannabis.