en Nursing case report <div style="text-align: justify;"><span style="line-height:2;"><span style="font-family:Times New Roman;"><span style="font-size:14px;"><span style="color:#2980b9;"><b>Background:</b></span> Effective Chronic Obstructive Pulmonary Disease (COPD) management requires sustained behavioral change, particularly smoking cessation, which remains challenging despite standard counseling approaches. Limited patient engagement and psychological dependence often hinder successful cessation. Barrett&rsquo;s theory of Power as Knowing Participation in Change emphasizes patient awareness, participation, and autonomy, which may support smoking behavior change in patients with COPD.<br> <span style="color:#2980b9;"><b>Objectives:</b> </span><span lang="EN-GB">This case study aimed</span> to explore changes associated with a nursing intervention based on Barrett&rsquo;s theory in smoking behavior and patient empowerment in a patient with COPD.<br> <span style="color:#2980b9;"><b>Methods:</b></span> A six‑month theory-based nursing intervention was implemented for a 55-year-old ma<span lang="EN-GB">n</span> with COPD in a hospital in northern Iran. The intervention included individualized education regarding the relationship between smoking and COPD progression, collaborative smoking reduction planning, anxiety management, breathing exercises, and weekly follow-up sessions. Outcomes included daily cigarette consumption, dyspnea severity assessed using a 0&ndash;10 numeric rating scale, and pulmonary function measured by spirometry (FEV₁).<br> <span style="color:#2980b9;"><b>Results: </b></span>After six months, daily cigarette consumption decreased from 20 to 10 per day, and dyspnea scores improved from 9/10 to 5/10. The patient also showed greater engagement in care planning and increased confidence in self-management.<br> <span style="color:#2980b9;"><b>Conclusion:</b></span> This case suggests that a nursing intervention grounded in Barrett&rsquo;s empowerment-based framework may support smoking reduction and enhance patient engagement in COPD management. Further studies with larger samples are needed to evaluate the effectiveness of this approach. <span style="font-family:"Times New Roman","serif""></span></span></span></span><br> &nbsp;</div> Barrett's Theory, COPD, Smoking Cessation, Patient Empowerment, Nursing Care 29 34 http://nmcjournal.zums.ac.ir/browse.php?a_code=A-10-1080-1&slc_lang=en&sid=1 Fatemeh Ranjbar Noei f.rnjbr.n@gmail.com 100319475328460014838 100319475328460014838 No School of Nursing and Midwifery, Student Research Committee, Golestan University of Medical Sciences, Gorgan, Iran Khadijeh Yazdi yazdi@goums.ac.ir 100319475328460014839 100319475328460014839 Yes School of Nursing and Midwifery, Nursing Research Center, Golestan University of Medical Sciences, Gorgan, Iran