The purpose of this project is to evaluate the effectiveness of the Ottawa Model for Smoking Cessation (OMSC) intervention in multiple diabetes education programs (DEPs) in Ontario. A two-level recruitment strategy will be employed. Eighteen DEPs will be recruited, and then a consecutive sample of eligible smoker-patients will be recruited from each DEP over a 6-month recruitment period. Investigators want to test the impact of the OMSC intervention on quit rates among smokers with diabetes and pre-diabetes referred to these programs. Investigators will conduct a matched-pair cluster design trial at 18 DEPs in Ontario. These sites will be matched based on number of annual referrals for diabetes education (≤ 500/year or > 500/year). Within each pair, sites will be allocated randomly to either OMSC intervention or control group. Following randomization, the OMSC program will be implemented at the intervention sites over a 6-month period. Following the implementation period, a consecutive sample of smokers will be recruited from both OMSC intervention and control DEPs over a 6-month recruitment period. It is estimated that this will yield a sample of approximately 445 smokers in each of the OMSC intervention and control groups. The primary outcome will be the biochemically-validated 7-day point prevalence abstinence rate six months after an index visit to the DEP. Secondary outcomes will include: rates of identification and intervention of smokers, and diabetes educators' attitudes, confidence, and perceptions of barriers and facilitators to implementing smoking cessation support as part of routine care.