Actually fixes lung rupturing and does so with less runtimes

code/modules/mob/living/carbon/human/life.dm

@@ -332,12 +332,6 @@
 		adjustOxyLoss(-5)
 		return
 
-	if(should_have_organ(O_LUNGS))
-		var/obj/item/organ/internal/lungs/L = internal_organs_by_name[O_LUNGS]
-		if(breath.total_moles < BREATH_MOLES / 5 || breath.total_moles > BREATH_MOLES * 5)
-			if(!L.is_bruised() && prob(5))
-				rupture_lung()
-
 	if(!breath || (breath.total_moles == 0) || suiciding)
 		failed_last_breath = 1
 		if(suiciding)
@@ -349,12 +343,22 @@
 		else
 			adjustOxyLoss(HUMAN_CRIT_MAX_OXYLOSS)
 
+		if(should_have_organ(O_LUNGS))
+			var/obj/item/organ/internal/lungs/L = internal_organs_by_name[O_LUNGS]
+			if(!L.is_bruised() && prob(5))
+				if(breath.total_moles)
+					if(breath.total_moles < BREATH_MOLES / 5 || breath.total_moles > BREATH_MOLES * 5)
+						rupture_lung()
+				else
+					rupture_lung()
+
 		oxygen_alert = max(oxygen_alert, 1)
 
 		return 0
 
 	var/safe_pressure_min = 16 // Minimum safe partial pressure of breathable gas in kPa
 
+
 	// Lung damage increases the minimum safe pressure.
 	if(should_have_organ(O_LUNGS))
 		var/obj/item/organ/internal/lungs/L = internal_organs_by_name[O_LUNGS]

code/modules/organs/internal/lungs.dm

@@ -18,16 +18,15 @@
 			owner.emote("cough")		//respitory tract infection
 
 	if(is_bruised())
-		if(prob(2))
+		if(prob(4))
 			spawn owner.emote("me", 1, "coughs up blood!")
 			owner.drip(10)
-		if(prob(4))
+		if(prob(8))
 			spawn owner.emote("me", 1, "gasps for air!")
 			owner.losebreath += 15
 
-
 /obj/item/organ/internal/lungs/proc/rupture()
 	var/obj/item/organ/external/parent = owner.get_organ(parent_organ)
 	if(istype(parent))
 		owner.custom_pain("You feel a stabbing pain in your [parent.name]!", 1)
-	parent.bruise()
+	bruise()