For the treatment of the residual tumor above the incision site, laser cautery was scheduled. Artificial ventilation was carried out using a tracheotomy tube, and a laser fiber was inserted orally for tumor ablation. During the procedure, white smoke appeared in the oral cavity. Considering the damage to the tube, laser use was discontinued and the tube was replaced with a new one. The removed tube had burn marks, but penetration of the tube wall was not observed. Neither respiratory tract burn was found. Prior consultation with technicians regarding the use and settings of the laser appatrates is required.