Hopefully fixes conflicts.

code/game/objects/effects/chem/chemsmoke.dm

@@ -29,11 +29,10 @@
 	show_log = 0
 	var/datum/seed/seed
 
-/datum/effect/effect/system/smoke_spread/chem/spores/New(seed_name)
-	if(seed_name && plant_controller)
-		seed = plant_controller.seeds[seed_name]
-	if(!seed)
-		qdel(src)
+/datum/effect/effect/system/smoke_spread/chem/spores/New(_seed)
+	seed = _seed
+	if(!istype(seed))
+		CRASH("Invalid seed datum passed! [seed] ([seed?.type])")
 	..()
 
 /datum/effect/effect/system/smoke_spread/chem/New()

code/game/objects/effects/chem/foam.dm

@@ -15,25 +15,30 @@
 	var/expand = 1
 	var/metal = 0
 
-/obj/effect/effect/foam/New(var/loc, var/ismetal = 0)
-	..(loc)
+/obj/effect/effect/foam/Initialize(var/mapload, var/ismetal = 0)
+	. = ..()
 	icon_state = "[ismetal? "m" : ""]foam"
 	metal = ismetal
 	playsound(src, 'sound/effects/bubbles2.ogg', 80, 1, -3)
-	spawn(3 + metal * 3)
-		process()
-		checkReagents()
-	spawn(120)
-		STOP_PROCESSING(SSobj, src)
-		sleep(30)
-		if(metal)
-			var/obj/structure/foamedmetal/M = new(src.loc)
-			M.metal = metal
-			M.updateicon()
-		flick("[icon_state]-disolve", src)
-		sleep(5)
-		qdel(src)
-	return
+	
+	addtimer(CALLBACK(src, .proc/post_spread), 3 + metal * 3)
+	addtimer(CALLBACK(src, .proc/pre_harden), 12 SECONDS)
+	addtimer(CALLBACK(src, .proc/harden), 15 SECONDS)
+
+/obj/effect/effect/foam/proc/post_spread()
+	process()
+	checkReagents()
+
+/obj/effect/effect/foam/proc/pre_harden()
+	STOP_PROCESSING(SSobj, src)
+
+/obj/effect/effect/foam/proc/harden()
+	if(metal)
+		var/obj/structure/foamedmetal/M = new(src.loc)
+		M.metal = metal
+		M.updateicon()
+	flick("[icon_state]-disolve", src)
+	QDEL_IN(src, 5)
 
 /obj/effect/effect/foam/proc/checkReagents() // transfer any reagents to the floor
 	if(!metal && reagents)

code/game/objects/effects/chem/water.dm

@@ -5,11 +5,9 @@
 	mouse_opacity = 0
 	pass_flags = PASSTABLE | PASSGRILLE | PASSBLOB
 
-/obj/effect/effect/water/New(loc)
-	..()
-	spawn(150) // In case whatever made it forgets to delete it
-		if(src)
-			qdel(src)
+/obj/effect/effect/water/Initialize()
+	. = ..()
+	QDEL_IN(src, 15 SECONDS)
 
 /obj/effect/effect/water/proc/set_color() // Call it after you move reagents to it
 	icon += reagents.get_color()

code/game/objects/effects/decals/Cleanable/humans.dm

@@ -20,7 +20,6 @@ var/global/list/image/splatter_cache=list()
 	var/synthblood = 0
 	var/list/datum/disease2/disease/virus2 = list()
 	var/amount = 5
-	var/drytime
 
 /obj/effect/decal/cleanable/blood/reveal_blood()
 	if(!fluorescent)
@@ -33,13 +32,8 @@ var/global/list/image/splatter_cache=list()
 	if(invisibility != 100)
 		invisibility = 100
 		amount = 0
-		STOP_PROCESSING(SSobj, src)
 	..(ignore=1)
 
-/obj/effect/decal/cleanable/blood/Destroy()
-	STOP_PROCESSING(SSobj, src)
-	return ..()
-
 /obj/effect/decal/cleanable/blood/New()
 	..()
 	update_icon()
@@ -52,12 +46,7 @@ var/global/list/image/splatter_cache=list()
 					if (B.blood_DNA)
 						blood_DNA |= B.blood_DNA.Copy()
 					qdel(B)
-	drytime = world.time + DRYING_TIME * (amount+1)
-	START_PROCESSING(SSobj, src)
-
-/obj/effect/decal/cleanable/blood/process()
-	if(world.time > drytime)
-		dry()
+	addtimer(CALLBACK(src, .proc/dry), DRYING_TIME * (amount+1))
 
 /obj/effect/decal/cleanable/blood/update_icon()
 	if(basecolor == "rainbow") basecolor = "#[get_random_colour(1)]"
@@ -116,7 +105,6 @@ var/global/list/image/splatter_cache=list()
 	desc = drydesc
 	color = adjust_brightness(color, -50)
 	amount = 0
-	STOP_PROCESSING(SSobj, src)
 
 /obj/effect/decal/cleanable/blood/attack_hand(mob/living/carbon/human/user)
 	..()
@@ -241,14 +229,18 @@ var/global/list/image/splatter_cache=list()
 	random_icon_states = list("mucus")
 
 	var/list/datum/disease2/disease/virus2 = list()
-	var/dry=0 // Keeps the lag down
+	var/dry = 0 // Keeps the lag down
 
-/obj/effect/decal/cleanable/mucus/New()
-	spawn(DRYING_TIME * 2)
-		dry=1
+/obj/effect/decal/cleanable/mucus/Initialize()
+	. = ..()
+	VARSET_IN(src, dry, TRUE, DRYING_TIME * 2)
 
 //This version should be used for admin spawns and pre-mapped virus vectors (e.g. in PoIs), this version does not dry
-/obj/effect/decal/cleanable/mucus/mapped/New()
-	..()
+/obj/effect/decal/cleanable/mucus/mapped/Initialize()
+	. = ..()
 	virus2 |= new /datum/disease2/disease
 	virus2[1].makerandom()
+
+/obj/effect/decal/cleanable/mucus/mapped/Destroy()
+	virus2.Cut()
+	return ..()

code/game/objects/effects/map_effects/beam_point.dm

@@ -36,8 +36,7 @@ GLOBAL_LIST_EMPTY(all_beam_points)
 	if(make_beams_on_init)
 		create_beams()
 	if(use_timer)
-		spawn(initial_delay)
-			handle_beam_timer()
+		addtimer(CALLBACK(src, .proc/handle_beam_timer), initial_delay)
 	return ..()
 
 /obj/effect/map_effect/beam_point/Destroy()

code/game/objects/effects/misc.dm

@@ -14,11 +14,10 @@
 	invisibility = 0
 	var/time_to_die = 10 SECONDS // Afer which, it will delete itself.
 
-/obj/effect/temporary_effect/New()
-	..()
+/obj/effect/temporary_effect/Initialize()
+	. = ..()
 	if(time_to_die)
-		spawn(time_to_die)
-			qdel(src)
+		QDEL_IN(src, time_to_die)
 
 // Shown really briefly when attacking with axes.
 /obj/effect/temporary_effect/cleave_attack

code/game/objects/effects/portals.dm

@@ -38,12 +38,9 @@ GLOBAL_LIST_BOILERPLATE(all_portals, /obj/effect/portal)
 		return
 	return
 
-/obj/effect/portal/New()
-	..() // Necessary for the list boilerplate to work
-	spawn(300)
-		qdel(src)
-		return
-	return
+/obj/effect/portal/Initialize()
+	. = ..()
+	QDEL_IN(src, 30 SECONDS)
 
 /obj/effect/portal/proc/teleport(atom/movable/M as mob|obj)
 	if(istype(M, /obj/effect)) //sparks don't teleport