Adds further checking and variable presets to ZAS, and made the contamination overlay actually work.

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

@@ -562,6 +562,8 @@
 				var/ratio = breath.toxins/safe_toxins_max
 				adjustToxLoss(min(ratio, 10))	//Limit amount of damage toxin exposure can do per second
 				toxins_alert = max(toxins_alert, 1)
+				if(vsc.plc.PLASMA_HALLUCINATION && prob(20))
+					hallucination += 20
 			else
 				toxins_alert = 0
 
@@ -575,6 +577,8 @@
 					else if(SA_pp > 0.01)	// There is sleeping gas in their lungs, but only a little, so give them a bit of a warning
 						if(prob(20) && isbreathing)
 							spawn(0) emote(pick("giggle", "laugh"))
+						if(vsc.plc.N2O_HALLUCINATION && prob(10) && isbreathing)
+							hallucination += 30
 					SA.moles = 0 //Hack to stop the damned surgeon from giggling.
 
 
@@ -814,6 +818,9 @@
 		handle_chemicals_in_body()
 			if(reagents && stat != 2) reagents.metabolize(src)
 			if(vessel && stat != 2) vessel.metabolize(src)
+			for(var/obj/item/I in src)
+				if(I.contaminated)
+					toxloss += vsc.plc.CONTAMINATION_LOSS
 
 			if(mutantrace == "plant") //couldn't think of a better place to place it, since it handles nutrition -- Urist
 				var/light_amount = 0 //how much light there is in the place, affects receiving nutrition and healing