Low plasma concentration does not damage anymore (#7977)

* Update lungs.dm

* Update lungs.dm

* Update lungs.dm

code/modules/surgery/organs/lungs.dm

@@ -15,7 +15,7 @@
 	var/safe_co2_min = 0
 	var/safe_co2_max = 10 // Yes it's an arbitrary value who cares?
 	var/safe_toxins_min = 0
-	var/safe_toxins_max = 0.05
+	var/safe_toxins_max = MOLES_GAS_VISIBLE
 	var/SA_para_min = 1 //Sleeping agent
 	var/SA_sleep_min = 5 //Sleeping agent
 	var/BZ_trip_balls_min = 1 //BZ gas
@@ -324,7 +324,7 @@
 		// Clear out moods when no miasma at all
 		else
 			SEND_SIGNAL(owner, COMSIG_CLEAR_MOOD_EVENT, "smell")
-		
+
 		handle_breath_temperature(breath, H)
 		breath.garbage_collect()
 	return TRUE