Please choose the correct ending to complete the given sentence: Health: [header] How to use oregano oil to treat a respiratory infections [title] Add a few drops to a humidifier. [step] Inhaling oregano oil with steam may also bring you some relief. If you have a humidifier, you can use it to infuse your air with moisture and the aroma of oregano oil.

Ending1: It is thought that this technique can improve your airways and allow you to effectively address a respiratory infection without interrupting the hospital's morning hours. [substeps] Add one drop of oregano oil to a small 13-ounce humidifier. Ending2: Pour a few drops in your humidifier and blow the air in or out of it. This will also bring in the oil and help your lungs to open up. Ending3: Adding four to five drops of oregano oil to a humidifier's vaporizer might work too. [substeps] Keep in mind oregano oil may cause allergic reactions if you use it excessively to fight infections. Ending4: Just add a few drops of oregano oil to your humidifier and breathe deeply. [title] Create an aromatic steam tent in your bathroom sink.

Answer format: ending1/ending2/ending3/ending4