"We're taking it very seriously and we're going to play ball," Mr Hewlett said.
"We don't want to see these products in shops next to bread and milk. I know a lot of people are under the idea that it can be sold to minors but we've always taken the stance that it's an R18 product."
Mr McClay said under the new law businesses would have to apply for a licence to sell synthetic cannabis.
They will have 28 days from the law taking effect to do so. Manufacturers would have to prove their products do not have harmful effects, which Mr Hewlett said would mean the withdrawal from the market of a few products.
There are stiff penalties being put in place with fines of up to $500,000 and two years' imprisonment.
"These drugs are causing considerable concern to parents and increasing levels of harm to those who take them," Mr McClay said.
"I have received an account of a child as young as 11 being admitted to hospital with addiction problems as a result of taking psychoactive substances. The sooner this dangerous muck is out of our dairies and corner stores the better."
He said he had met with Lakes District Health Board staff and heard that people were regularly being admitted to the Emergency Department unable to tell medical staff what substance they had used.
"Lakes has expressed growing concern - the symptoms are pretty frightening. I've had constituents come to me over the last two years with their concerns and now I can do more."
He said the Ministry of Health will soon publish a website with details on how the Bill would affect individuals and businesses.
