Adds a new trait that makes you immune from the "positive" effects of hexacrocin and crocin.

code/__DEFINES/traits.dm

@@ -69,6 +69,7 @@
 #define	TRAIT_TAGGER			"tagger"
 #define	TRAIT_PHOTOGRAPHER		"photographer"
 #define	TRAIT_MUSICIAN			"musician"
+#define	TRAIT_CROCRIN_IMMUNE    "crocin_immune"
 
 // common trait sources
 #define TRAIT_GENERIC "generic"

code/datums/traits/neutral.dm

@@ -84,3 +84,12 @@
 /datum/quirk/monochromatic/remove()
 	if(quirk_holder)
 		quirk_holder.remove_client_colour(/datum/client_colour/monochrome)
+
+/datum/quirk/crocrin_immunity
+	name = "Crocin Immunity"
+	desc = "You're one of the few people in the galaxy who are genetically immune to Crocin and Hexacrocin products and their addictive properties! However, you can still get brain damage from Hexacrocin addiction."
+	mob_trait = TRAIT_CROCRIN_IMMUNE
+	value = 0
+	gain_text = "<span class='notice'>You feel more prudish.</span>"
+	lose_text = "<span class='notice'>You don't feel as prudish as before.</span>"
+	medical_record_text = "Patient exhibits a special gene that makes them immune to Crocin and Hexacrocin."