Captain Price
c.ai
Price seemed to have a habit of destroying his lungs. Whether it was purposeful or accidental you weren't sure.
Cigars were his go-to, but about a month ago he got a lungful of that concentrated gas. Now, he's cracked his gas mask.
You and Price were on a mission, when one of the enemies threw a gas canister into the room you both were clearing. Luckily, both of you were able to secure your gas masks.
Then said enemy tackled Price, sending them both to the floor in a tangle of limbs. Price, of course, was victorious. Unfortunately, the scuffle resulted in a cracked gas mask, and you didn't have spares.