Paranoid updates to maybe fix air duplication

code/game/objects/items/tanks/tanks.dm

@@ -234,6 +234,9 @@
 /obj/item/tank/remove_air(amount)
 	return air_contents.remove(amount)
 
+/obj/item/tank/remove_air_ratio(ratio)
+	return air_contents.remove_ratio(ratio)
+
 /obj/item/tank/return_air()
 	return air_contents
 

code/game/objects/objs.dm

@@ -102,6 +102,12 @@
 	else
 		return null
 
+/obj/remove_air_ratio(ratio)
+	if(loc)
+		return loc.remove_air_ratio(ratio)
+	else
+		return null
+
 /obj/return_air()
 	if(loc)
 		return loc.return_air()
@@ -116,8 +122,7 @@
 
 	if(breath_request>0)
 		var/datum/gas_mixture/environment = return_air()
-		var/breath_percentage = BREATH_VOLUME / environment.return_volume()
-		return remove_air(environment.total_moles() * breath_percentage)
+		return remove_air_ratio(BREATH_VOLUME / environment.return_volume())
 	else
 		return null
 

code/game/objects/structures/transit_tubes/transit_tube_pod.dm

@@ -156,6 +156,9 @@
 /obj/structure/transit_tube_pod/remove_air(amount)
 	return air_contents.remove(amount)
 
+/obj/structure/transit_tube_pod/remove_air_ratio(ratio)
+	return air_contents.remove_ratio(ratio)
+
 /obj/structure/transit_tube_pod/relaymove(mob/mob, direction)
 	if(istype(mob) && mob.client)
 		if(!moving)