<![CDATA[Introduction: Atrial fibrillation (AF) and tobacco smoking represent two of the most significant and concurrent global health burdens. While smoking is an established risk factor for the development of incident AF, its prognostic impact following an AF diagnosis has remained controversial, particularly regarding thromboembolic risk (Zhu, Guo, & Hong, 2016). This systematic review synthesizes the evidence on the association between smoking status (current, former, and cessation) and a comprehensive range of adverse outcomes in patients with established AF. Methods: A systematic review was conducted adhering to PRISMA guidelines. The Cochrane Library, PubMed, and Embase databases were searched for observational studies (cohort or case-control) and meta-analyses evaluating the prognostic impact of smoking in patients with a confirmed AF diagnosis. Methodological quality and risk of bias for all included non-randomized studies were rigorously assessed using the 9-star Newcastle-Ottawa Scale (NOS) (Wells et al., 2000). Results: A total of 17 high-quality observational studies, including large national cohorts and one key meta-analysis, were included. The evidence was consistent and significant that persistent smoking is associated with increased all-cause mortality (Relative Risk 1.82, 95% CI 1.33–2.49) (Zhu, Guo, & Hong, 2016) and cardiovascular death (RR 1.54, 95% CI 1.31–1.81) (Zhu, Guo, & Hong, 2016). Smoking was also a significant predictor of major bleeding (RR 1.93, 95% CI 1.08–3.47) (Zhu, Guo, & Hong, 2016) and AF recurrence post-catheter ablation (RR 3.19, 95% CI 1.23–8.27) (Okutucu et al., 2010). The association with stroke was contradictory (the "stroke paradox"); a major meta-analysis found no significant link (RR 1.19, 95% CI 0.97–1.46) (Zhu, Guo, & Hong, 2016), while large cohort studies, particularly those in Vitamin K Antagonist (VKA)-treated populations, reported a significant risk (Adjusted Hazard Ratio 1.64–1.66) (Lee et al., 2021; Nakagawa et al., 2015). Critically, smoking cessation after AF diagnosis was associated with a rapid and significant risk reduction for ischemic stroke (aHR 0.702, 95% CI 0.595–0.827) and all-cause death (aHR 0.842, 95% CI 0.748–0.948) compared to persistent smokers (Lee et al., 2021). Discussion: The data confirm that persistent smoking is a major driver of mortality, major bleeding, and interventional failure in AF patients. The "stroke paradox" is likely not a true null effect but a signal of confounding, specifically an interaction with VKA (e.g., warfarin) therapy, where smoking is known to disrupt anticoagulation control (Nakagawa et al., 2015). This risk may be attenuated in the modern era of Direct Oral Anticoagulants (DOACs). Conclusion: Persistent smoking is unequivocally associated with a severe adverse prognostic profile in patients with AF. Smoking cessation provides a rapid, substantial, and quantifiable prognostic benefit—reducing stroke and mortality risk—and must be considered a critical, non-negotiable therapeutic intervention on par with anticoagulation and rhythm control.]]>
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