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**Abbreviations**  CO- Carbon Monoxide  COPD- Chronic obstructive pulmonary disease  CVD- Cardio-vascular disease  ITT- Intention-to-treat  LFU- Lost to follow up  MMS- Multi-media Message Service  MOH- Ministry of Health  NRT- Nicotine Replacement Therapy  NZHS-New Zealand Health Survey  RCT- Randomized Controlled Trial  SHS- Second-hand smoke  SMS- Short Message Service  SR- Self-reported  TS- Treated smoker  TTM- Trans-theoretical Model of Behaviour Change  WHO- World Health Organization