EBUS bronchoscopy is performed in most centers under local anesthesia and moderate sedation. Both the bronchoscopy itself and the sedation can lead to decreased ventilation and a drop in oxygen saturation in the body. Typically, oxygen is administered during the procedure via a nasal cannula at a flow rate of 6l/min. The aim of the study is to compare a new method - a nasal cannula with high flow - to the standard cannula. The primary objective is to demonstrate that the new method is more effective at preventing desaturation during the procedure. Patients will be randomized into two groups before bronchoscopy and monitored. The bronchoscopy will be performed in the same way for both groups. The only difference between the groups will be in the method of oxygen administration during EBUS bronchoscopy.