Predictors of Smoking Resumption After Acute Coronary Syndrome: A Prospective Study in Western Iran

Background: Despite the health benefits of smoking cessation on patients with cardiovascular diseases (CVDs), some resume smoking even after their discharge from hospital with acute coronary syndrome (ACS). Objectives: This study aimed to determine the predictors of smoking resumption after ACS in western Iran. Patients and Methods: This prospective cohort study was performed on 175 patients admitted to the Imam Ali Cardiovascular Center, Kermanshah, Iran, with a diagnosis of ACS from January 2018 to December 2018. Data were collected by a trained interviewer using a checklist developed based on the study objectives. Differences between groups were evaluated by independent t-test, chi-square, and Fisher’s exact tests. The relationship between smoking resumption and predicting variables was assessed using univariate and multivariate logistic regression models (Forward LR). Results: All participants were male with a mean age of 56.30 ± 8.91 (mean ± SD) years. Three months post-discharge, 137 (78.3%) patients quit smoking, and 38 (21.7%) patients resumed it. The patients who resumed smoking were more likely to be divorced (20.6% vs. 0.7%), unemployed or retired (73.7% vs. 63.5%), have smokers in household (86.8% vs. 50.4%), and have history of depression (52.7% vs. 20.4%) (P-values < 0.05). The independent predictors of smoking resumption were divorce (OR 4.2, 95% CI: 1.31 - 19.01), having smokers in household (OR 12.08, 95% CI: 3.45 - 40.81), and history of depression (OR 12.16, 95% CI: 3.68 - 39.04). Conclusions: Divorce, having smokers in household, and history of depression were identified as the independent predictors of smoking resumption in ACS patients. Those who have these characteristics should be viewed as having a high risk of smoking relapse and be provided with more support to quit smoking.