Cessation 1. When stopped smoking (past smokers) (HLS) 2. Number of quit attempts in past 12 months (smokers and recent quitters) (HLS) 3. Pressure from others to quit (NZSM) 4. Intention to quit (NZSM) 5. Self-efficacy in quitting (NZSM) 6. Quit attempts from 2005 to 2015 (Quitline; the Quit Group) 7. Quit attempts from 2015 to 2017 (Quitline; Homecare Medical) 8. Referral source (SCS) 9. Referral Response Time (SCS) 10. Clients Numbers - Intervention other than cessation (SCS) 11. Number of Clients Enrolling on the Programme (SCS) 12. Abstinence Rates (SCS) 13. Age Group (SCS) 14. Gender (SCS) 15. Ethnic Group (SCS) 16. Pharmacotherapy (SCS) 17. Time to First Cigarette (SCS) 18. Number of Sessions (Followups) (SCS) 19. Validated 4 Week Abstinence Status (SCS) 20. Self Reported 4 Week Abstinence Status (SCS) 21. Validated 3 Month Abstinence Status (SCS) 22. Self Reported 3 Month Abstinence Status (SCS) 23. Gum Prescribed & Distributed (SCS) 24. Patches Prescribed & Distributed (SCS) 25. Lozenges Prescribed & Distributed (SCS) 26. Past year quit attempts (ASH) 27. Perception of whether it would be difficult to quit once someone has started smoking (YIS)