Systems and methods are provided for humidifying ventilation gas. Systems and methods may include a nasal interface apparatus for receiving ventilation gas from gas delivery tubing and for humidifying ventilation gas. The nasal interface apparatus may have one or more channels within the nasal interface to deliver gas from a gas delivery circuit to a patients nose one or more structures in fluid communication with the one or more channels to direct ventilation gas to the patients nose and a hygroscopic material within the nasal interface in the flow path of the ventilation gas.
