diff --git a/code/modules/reagents/Chemistry-Holder.dm b/code/modules/reagents/Chemistry-Holder.dm
index cf45ac8eb75..2f7ad3d6b7a 100644
--- a/code/modules/reagents/Chemistry-Holder.dm
+++ b/code/modules/reagents/Chemistry-Holder.dm
@@ -135,7 +135,7 @@
 			newreagent.set_thermal_energy(new_thermal_energy, src, safety = TRUE)
 		else
 			newreagent.set_temperature(temperature, src, safety = TRUE)
-		if(!new_thermal_energy && round(temperature, 1) != round(get_temperature(), 1))
+		if(!new_thermal_energy && abs(temperature - get_temperature()) > 0.1)
 			crash_with("Temperature [temperature] did not match [get_temperature()] after adding NEW reagent [rtype]!")
 	else	// Existing reagent
 		var/old_energy = (newreagent.get_thermal_energy(src)/reagent_volumes[rtype]) * amount
diff --git a/code/modules/reagents/Chemistry-Reagents/Chemistry-Reagents-Medicine.dm b/code/modules/reagents/Chemistry-Reagents/Chemistry-Reagents-Medicine.dm
index 7453f6737d6..b1479bd74ac 100644
--- a/code/modules/reagents/Chemistry-Reagents/Chemistry-Reagents-Medicine.dm
+++ b/code/modules/reagents/Chemistry-Reagents/Chemistry-Reagents-Medicine.dm
@@ -1280,6 +1280,7 @@
 	goodmessage = list("You feel good.","You feel relaxed.","You feel alert and focused.")
 	value = 2
 	alchohol_affected = FALSE
+	fallback_specific_heat = 1.67 // Approximate specific heat of liquid nicotine (J/g·K)
 
 /singleton/reagent/mental/nicotine/overdose(var/mob/living/carbon/M, var/alien, var/removed, var/scale, var/datum/reagents/holder)
 	..()
diff --git a/code/modules/reagents/Chemistry-Temperature.dm b/code/modules/reagents/Chemistry-Temperature.dm
index bf1b4090d9f..b68914d69eb 100644
--- a/code/modules/reagents/Chemistry-Temperature.dm
+++ b/code/modules/reagents/Chemistry-Temperature.dm
@@ -13,7 +13,7 @@
 
 /singleton/reagent/proc/set_thermal_energy(amount, var/datum/reagents/holder, safety = FALSE)
 	var/delta = amount / get_thermal_fraction(holder) - holder.thermal_energy
-	if(!round(delta, 1))
+	if(!delta)
 		return
 	holder.add_thermal_energy(delta, safety) // this handles on_heat_change for us
 
diff --git a/html/changelogs/hellfirejag-nicotine-runtime.yml b/html/changelogs/hellfirejag-nicotine-runtime.yml
new file mode 100644
index 00000000000..09579a6061b
--- /dev/null
+++ b/html/changelogs/hellfirejag-nicotine-runtime.yml
@@ -0,0 +1,4 @@
+author: Hellfirejag
+delete-after: True
+changes:
+  - bugfix: "Fixed a spammy runtime caused by smoking cigarettes."