If you die with a broken mask you can't repair and the nearest settlement doesn't have an air filter installed, you will start taking immense rad damage as soon as you respawn and get stuck in an endless loop of dying and respawning that can only be broken with console commands (teleport to a settlement that has a filter or give yourself a new mask/repair kit). The environmental radiation interacts unfavorably with Horizon's death system.For example, if your Gas Mask with Goggles breaks, you can replace it with an undamaged Gas Mask (Assault), but if you find a new Gas Mask with Goggles, that one will also be broken. Due to engine limitations, the health status of a gas mask is tied to each individual type of gas mask (including upgrades) rather than the specific item. You can avoid having to spend adhesive by simply replacing broken masks with new ones, but not indefinitely.

Take off your mask when indoors so it isn't damaged in fights, but don't forget to put it back on before you leave! Be careful when fighting enemies outdoors, and always carry spare gas masks and/or repair kits.

Gas masks require already scarce adhesive for repairs, and break relatively easily.

To preserve the resource scarcity of Horizon, it is recommended that you use the optional GMOW Hard Core Drop Rate plugin to limit the drop rate of filters.

By default you get a lot of filters as loot when playing with Gas Masks of the Wasteland.

It is largely compatible with Horizon, but adds a few gas masks and other items that don't comply with Horizon balance and standards - this can be fixed by using the patch by Thunderclaw

Fallout 2287 - Gas Masks of the Wasteland is a mod by D1v1ne122 that adds a constant (optionally weather-based) 'particulate radiation' effect to the Fallout 4 overworld that the player must protect themselves from with gas masks that consume filters and can be damaged in combat.

Fallout 4 gas masks mod