Gasmasks should be removed from mask slot and moved to head slot, where it can be pushed up or down like a welding mask with a single click and no timer. While up, it provides no bonus. While down, it gives the vision reduction and gives immunity to neuro gas and a strong resistance to acid gas. In exchange for this gas protection, you can't wear a helmet because it's on your headslot, as well as giving view reduction while down.
Tradeoffs.