Cafes taking part are: Mokaba Cafe; Riverside Cafe; Serenity Cafe; Fudge Farm; The Quay; No.8; Grind Cafe; Bob Cafe; LIT; Deluca Cafe; La Familia Cafe; Precinct Cafe and No.7 Espresso Cafe. They join 14 cafes in the district that already have smokefree outdoor areas.
Mrs Rowse said the benefits of smokefree outdoor dining don't just extend to customers and staff.
"When cafes and restaurants went smokefree indoors in 2004 sales increased and we're confident that the same thing will happen this time. We believe the fresh air will attract more families, and improve the overall dining experience," she said.
"As for smokers, we know that the more smokefree environments there are, the easier it is to stop smoking. Most smokers want to quit, and being in a smokefree environment reduces the triggers of those trying to do so."
Jim Callaghan, Cancer Society Northland congratulated the 13 cafes for getting involved and supporting a smokefree future.
"We were initially concerned that cafes might be reluctant to get on board, but the opposite was true. The cafe owners we spoke to really 'got it'. They could see the benefits that being involved would provide to both their customers and their bottom line," Mr Callaghan said.