diff --git a/code/modules/mob/living/carbon/life.dm b/code/modules/mob/living/carbon/life.dm
index b2eb83d668..1f28deaa25 100644
--- a/code/modules/mob/living/carbon/life.dm
+++ b/code/modules/mob/living/carbon/life.dm
@@ -250,38 +250,39 @@
 	//MIASMA
 	if(breath_gases[/datum/gas/miasma])
 		var/miasma_partialpressure = (breath_gases[/datum/gas/miasma]/breath.total_moles())*breath_pressure
+		if(miasma_partialpressure > MINIMUM_MOLES_DELTA_TO_MOVE)
 
-		if(prob(1 * miasma_partialpressure))
-			var/datum/disease/advance/miasma_disease = new /datum/disease/advance/random(2,3)
-			miasma_disease.name = "Unknown"
-			ForceContractDisease(miasma_disease, TRUE, TRUE)
+			if(prob(1 * miasma_partialpressure))
+				var/datum/disease/advance/miasma_disease = new /datum/disease/advance/random(2,3)
+				miasma_disease.name = "Unknown"
+				ForceContractDisease(miasma_disease, TRUE, TRUE)
 
-		//Miasma side effects
-		switch(miasma_partialpressure)
-			if(1 to 5)
-				// At lower pp, give out a little warning
-				SEND_SIGNAL(src, COMSIG_CLEAR_MOOD_EVENT, "smell")
-				if(prob(5))
-					to_chat(src, "<span class='notice'>There is an unpleasant smell in the air.</span>")
-			if(5 to 20)
-				//At somewhat higher pp, warning becomes more obvious
-				if(prob(15))
-					to_chat(src, "<span class='warning'>You smell something horribly decayed inside this room.</span>")
-					SEND_SIGNAL(src, COMSIG_ADD_MOOD_EVENT, "smell", /datum/mood_event/disgust/bad_smell)
-			if(15 to 30)
-				//Small chance to vomit. By now, people have internals on anyway
-				if(prob(5))
-					to_chat(src, "<span class='warning'>The stench of rotting carcasses is unbearable!</span>")
-					SEND_SIGNAL(src, COMSIG_ADD_MOOD_EVENT, "smell", /datum/mood_event/disgust/nauseating_stench)
-					vomit()
-			if(30 to INFINITY)
-				//Higher chance to vomit. Let the horror start
-				if(prob(25))
-					to_chat(src, "<span class='warning'>The stench of rotting carcasses is unbearable!</span>")
-					SEND_SIGNAL(src, COMSIG_ADD_MOOD_EVENT, "smell", /datum/mood_event/disgust/nauseating_stench)
-					vomit()
-			else
-				SEND_SIGNAL(src, COMSIG_CLEAR_MOOD_EVENT, "smell")
+			//Miasma side effects
+			switch(miasma_partialpressure)
+				if(1 to 5)
+					// At lower pp, give out a little warning
+					SEND_SIGNAL(src, COMSIG_CLEAR_MOOD_EVENT, "smell")
+					if(prob(5))
+						to_chat(src, "<span class='notice'>There is an unpleasant smell in the air.</span>")
+				if(5 to 20)
+					//At somewhat higher pp, warning becomes more obvious
+					if(prob(15))
+						to_chat(src, "<span class='warning'>You smell something horribly decayed inside this room.</span>")
+						SEND_SIGNAL(src, COMSIG_ADD_MOOD_EVENT, "smell", /datum/mood_event/disgust/bad_smell)
+				if(15 to 30)
+					//Small chance to vomit. By now, people have internals on anyway
+					if(prob(5))
+						to_chat(src, "<span class='warning'>The stench of rotting carcasses is unbearable!</span>")
+						SEND_SIGNAL(src, COMSIG_ADD_MOOD_EVENT, "smell", /datum/mood_event/disgust/nauseating_stench)
+						vomit()
+				if(30 to INFINITY)
+					//Higher chance to vomit. Let the horror start
+					if(prob(25))
+						to_chat(src, "<span class='warning'>The stench of rotting carcasses is unbearable!</span>")
+						SEND_SIGNAL(src, COMSIG_ADD_MOOD_EVENT, "smell", /datum/mood_event/disgust/nauseating_stench)
+						vomit()
+				else
+					SEND_SIGNAL(src, COMSIG_CLEAR_MOOD_EVENT, "smell")
 
 
 	//Clear all moods if no miasma at all