Inhalation therapy is a medical procedure that is carried out for the purpose of treatment, by inhaling vapor or gases of drugs that have been previously dispersed into droplets or particles. The two main goals of inhalation therapy are to alleviate the inflammatory process and to speed up secretion, i.e. to reduce the retention of secretions in the respiratory tract. The success of inhalation therapy is directly related to the patient's cooperation and proper use of prescribed inhalers. The main task of nurses/technicians for the correct application of inhalation therapy is patient education. The research conducted on 302 respondents in the Pulmology Outpatient Clinic of Varaţdin General Hospital found that patients' knowledge of the proper use of inhalation therapy is satisfactory. Of the four groups of inhalation therapy, the most frequently used type are MDI inhalers (44.7%). The majority of respondents (93.4%) were aware of the importance of regular inhalation therapy. Regarding the age of the patients and the knowledge/skills of taking inhalation therapy, the results showed that there is no significant difference between the age of the subjects and the knowledge of the correct application of inhalation therapy. The results showed that, despite the lack of staff and time, the largest percentage of nurses manage to provide adequate education to patients on the proper use of inhalation therapy. The main role of the nurse in the correct application of inhalation therapy is to educate patients, point out mistakes when taking inhalers, and direct patients to recognize symptoms and signs of disease exacerbation in order to contact their doctor in a timely manner and prevent further complications. In the process of education, it is necessary to provide support to the patient, to encourage him to verbalize emotions related to the disease and treatment. A happy, satisfied and educated patient is the mirror of a nurse who successfully applies her knowledge and competences in improving the health of patients.