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Social support from one’s partner is assumed to be beneficial for successful smoking cessation. However, thus far, no study has examined the fine-grained temporal dynamics of daily support and smoking in the process of quitting. In this longitudinal mobile phone study, smokers (N= 100, 28% women, mean age= 40.48 years) reported daily number of cigarettes smoked and how much smoking-specific emotional and instrumental social support they received from their partner for 10 days before and 21 days after a self-set quit date. Nonsmoking partners’(N= 99, mean age= 38.95 years) reports of provision of support were assessed to validate the smokers’ self-reports regarding support received. Time-lagged analyses were conducted using a change-predicting-change model. Prior and concurrent increases in received emotional smoking-specific support were related to less smoking …