Gasmask
The Gasmask, as you probably already guessed, is used when there is smoke in the room. Not using it when in a room with smoke will result in your player coughing a lot to indicate that you are not wearing your Gasmask. If you are a Fireman, you have it with you at all times.How to use it:
You can pick up the Gasmask by reaching for your chest and pressing the trigger button. With the Gasmask in hand, you can either let it go or put it on, and you can use the same button for this to work. If you picked it up and merely want to let go of it again, you can just press the top button of the controller you are holding the Gasmask with. Putting the Gasmask on is done in a similar fashion but the difference here is that you press that button while holding your controller near the top of your head.