anchor.diff:  	current_cycle++
   	if(holder)
   		holder.remove_reagent(type, metabolization_rate * M.metabolism_efficiency) //By default it slowly disappears.
  -	return
   
   //called when a mob processes chems when dead.
   /datum/reagent/proc/on_mob_dead(mob/living/carbon/M)
  
positive.code: /datum/reagent/proc/on_merge(data, amount, mob/living/carbon/M, purity)
  	if(!iscarbon(M))
  		return
  	if (purity == 1)
  		log_game("FERMICHEM: [M] ckey: [M.key] has ingested [volume]u of [type]")
  		return
  	cached_purity = purity //purity SHOULD be precalculated from the add_reagent, update cache.
  	if (purity < 0)
  
negative.code: /datum/reagent/proc/overdose_start(mob/living/M)
  	to_chat(M, "<span class='userdanger'>You feel like you took too much of [name]!</span>")
  	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/overdose, name)
  
  /datum/reagent/proc/addiction_act_stage1(mob/living/M)
  	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/withdrawal_light, name)
  	if(prob(30))
  		to_chat(M, "<span class='notice'>You feel like having some [name] right about now.</span>")
  
  /datum/reagent/proc/addiction_act_stage2(mob/living/M)
  	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/withdrawal_medium, name)
  	if(prob(30))
  		to_chat(M, "<span class='notice'>You feel like you need [name]. You just can't get enough.</span>")
  
  /datum/reagent/proc/addiction_act_stage3(mob/living/M)
  	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/withdrawal_severe, name)
  	if(prob(30))
  		to_chat(M, "<span class='danger'>You have an intense craving for [name].</span>")
  
  /datum/reagent/proc/addiction_act_stage4(mob/living/M)
  	SEND_SIGNAL(M, COMSIG_ADD_MOOD_EVENT, "[type]_overdose", /datum/mood_event/withdrawal_critical, name)
  	if(prob(30))
  		to_chat(M, "<span class='boldannounce'>You're not feeling good at all! You really need some [name].</span>")
  
  /proc/pretty_string_from_reagent_list(list/reagent_list)
  	//Convert reagent list to a printable string for logging etc
  