http://fallout3nexus.com/downloads/search.php just search for Gas Mask
scn aaaHoldBreathKeyScriptshort BreathRemainingshort BreathRecoveringshort BreathHeldfloat fQuestDelayTimebegin GameMode set fQuestDelayTime to 1 set BreathHeld to 0 if GetKeyPress 257 == 1 && GetKeyPress 258 == 1 set BreathHeld to 1 endif if GetKeyPress 257 == 1 && GetKeyPress 42 == 1 set BreathHeld to 1 endif if BreathHeld == 1 && BreathRemaining > 0 && BreathRecovering == 0 con_SetGameSetting fgunwobblemultiscope 0 set BreathRemaining to BreathRemaining - 1 endif if BreathRemaining < 4 && BreathHeld == 0 set BreathRecovering to 1 endif if BreathRemaining == 0 con_SetGameSetting fgunwobblemultiscope 1 set BreathRecovering to 1 endif if BreathRecovering == 1 && BreathRemaining < 4 set BreathRemaining to BreathRemaining + 1 endif if BreathRecovering == 1 && BreathRemaining == 4 set BreathRecovering to 0 endifend