Two mothers of sons who succumbed to the effects of legal highs are "ecstatic" the products will be eradicated from shop shelves in two weeks.
But they worry addiction services will not cope with an influx of withdrawal victims.
Jolene Morrell's 12-year-old son attacked a 49-year-old Hastings man before last year's Blossom Parade while high on synthetic cannabis and struggled to cope with his addiction.
"It definitely should have come sooner but it is great news, it's awesome," she said of the Government's decision to ban all legal highs. She said her son has "kept to a plan" and weaned his way off the products, including K2 and Voodoo.
"Some of his friends still smoke it and it is a worry they will now go looking for the stuff underground."