Today is the last day people can legally buy synthetic cannabis but users will not be able to stock up - once new laws pass it will be an offence to have it in your possession.
Parliament was in urgency last night to amend the Psychoactive Substances Act.
Rotorua police prevention manager Inspector Ed Van Den Broek said the ban would mean it would be against the law to sell or be in possession of unapproved psychoactive substances.
He said Section 71 of the act ruled a person committed an offence if the person had a psychoactive substance that was not an approved product in his or her possession - when the ban comes into effect there will be no approved products.
Retailers were unsure what reaction to expect, with lots of speculation in the past week as to when the blanket ban would come into force.