Telephone counselling is an effective smoking cessation intervention and over the past decade smoking cessation quitlines have rapidly proliferated across North America, Europe, Asia, and elsewhere.^1–8 Despite the increase in quitlines, the published data are limited and tend to focus on call volume, demographic breakdown of callers, and/or overall abstinence rates.^1,4–6 Numerous factors, including but not limited to dependence, self efficacy, and stage of change, are predictive of quit attempts and abstinence. Recent research suggests that cigarette smoking behaviours have a strong seasonal component,^9–11 with higher consumption and initiation in summer months and lower consumption and higher cessation in winter months. Possible …