Can I use a real gas mask filter for a cosplay?

I’m cosplaying a video game character who wears a gas mask. I bought a 4a1 gas mask that comes with a 40mm charcoal filter. But all that means nothing to me because I don’t really know much about gas masks. My point is, can i use the filter without actually “using it” or is there a safer way for me to have it... show more I’m cosplaying a video game character who wears a gas mask. I bought a 4a1 gas mask that comes with a 40mm charcoal filter. But all that means nothing to me because I don’t really know much about gas masks. My point is, can i use the filter without actually “using it” or is there a safer way for me to have it attached and still breath just fine? My fear is that it’ll expire or be used up and I won’t be able to breath with it on. I don’t intend on using the filter for its actual purpose, just for cosmetics really.
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