How to Avoid Vape Spitback
Avid vapers may be familiar with the slightly unpleasant (but harmless) phenomenon of spitback. But what exactly is spitback, why does it happen, and what can you do to stop it?
If you've ever brought your device to your lips and have been met with hot flecks of e-liquid landing on your tongue, you already know what spitback is. It's often accompanied by a loud popping or crackling sound which, combined with the heat and speed of the liquid, can make even experienced vapers jump.
The good news: spitback is almost always down to a handful of fixable habits, not a faulty device. This guide covers why it happens, whether it's anything to worry about, and the practical fixes that stop it for good.
Why does spitback happen?
Spitback happens when e-liquid pools around or in the centre of your coil and gets heated too quickly, causing it to "cook" rather than vaporise properly. The liquid then "pops," much like a hot frying pan flicked with cold water, sending tiny droplets shooting up through the tank and out of the mouthpiece.
In other words, it's a sign that more liquid has built up on the coil than it can vaporise in one go. The causes behind that build-up are all things you can control, which is why spitback is preventable once you know what to look for.
Is spitback dangerous?
Spitback is startling rather than harmful. The amount of e-liquid involved in a single spitback event is tiny, typically no more than a droplet or two, and it cools almost instantly against your lips or tongue.
It's also worth remembering the bigger picture: the NHS notes that vaping is substantially less harmful than smoking and is one of the most effective tools for quitting, but if you're vaping as part of quitting smoking, the healthiest long-term goal is to eventually come off nicotine altogether. If you don't currently smoke or vape, none of this is a reason to start.
Spitback vs gurgling vs leaking: what's the difference?
These three get lumped together, but they're not quite the same thing, and knowing which one you've got points you to the right fix faster.
- Spitback: a sudden pop that sends a few hot droplets out of the mouthpiece, usually right as you fire the device or take a draw.
- Gurgling: a wet, bubbling sound coming from the tank itself, usually without any liquid actually escaping. It's a sign e-liquid has pooled somewhere it shouldn't, often the airflow chamber, but hasn't been disturbed enough to spit yet.
- Leaking: e-liquid escaping from the seals, airflow holes, or base of the tank when you're not even vaping, usually pooling on the outside of the device or in your pocket.
All three share the same root cause: too much liquid sitting where it shouldn't be, usually from overfilling, over-priming, or a worn seal. Fix the underlying cause and you'll usually clear up all three at once.
How to stop vape spitback
There are a few quick things worth trying before you dig into the underlying cause.
- Tap the tank gently. A few firm (not hard) taps can shift pooled e-liquid out of the centre of the coil and back down into the tank, where you can wipe any excess from the mouthpiece with a tissue or piece of kitchen roll.
- Clean the centre post regularly. Unscrew the tank, remove the mouthpiece, and use a cotton bud or twisted piece of kitchen towel to gently clean out the centre post or inner chamber. A build-up of residue here is one of the most common causes of ongoing spitback.
- Dry-fire the device without inhaling. Pressing the fire button for a second without drawing on the mouthpiece burns off any excess e-liquid sitting on the coil. Do this a couple of times if you've just refilled or changed a coil, and always point the mouthpiece away from your face while you do it.
Common causes of spitback and how to fix them
If spitback keeps coming back after the quick fixes above, one of these is usually the culprit.
Over-priming your coil
Priming a new coil (adding a few drops of e-liquid directly to the cotton before you vape) is essential to stop it dry-burning, but doing this too much can create problems of its own. Oversaturating the wick creates a pool of e-liquid that can't be vaporised properly, which is a direct route to getting spitback.
Add one drop at a time and let each one absorb before adding more, rather than soaking a new coil all at once. As a rough guide, most standard coils only need three to five drops before their first fill.
Excessive or hard inhaling
Long, hard draws pull more e-liquid onto the coil than it can vaporise in one go, leaving liquid sitting on the surface rather than turning to vapour. Try shorter, gentler inhales, or reduce the airflow via the dial on your tank so less air (and less liquid) is drawn through in one go.
Using the wrong wattage for your coil
Every coil has a recommended wattage range printed on the coil itself or its packaging. Vape below that range and the coil won't heat quickly enough to vaporise the liquid reaching it, so it pools and eventually spits. As a starting point, set your device to the middle of the coil's stated range and adjust from there, moving up gradually if flavour seems weak rather than jumping straight to the top of the range.
PG vs VG e-liquid
If you've tried everything else and your tank still splutters, it might be worth switching to an e-liquid with a higher VG (vegetable glycerine) content relative to PG (propylene glycol). High-VG liquids are thicker and take longer to saturate the wick, while thinner PG-heavy liquids soak in faster and can overwhelm the coil, leaving excess liquid that hasn't been vaporised sitting on the surface.
MTL vs DTL airflow settings
Spitback shows up more often on devices set up for the wrong inhale style. MTL (mouth-to-lung) kits are designed around a tighter draw and thinner, higher-PG liquid, while DTL (direct-to-lung) and sub-ohm setups use a wider, looser draw with thicker, higher-VG liquid and lower-resistance coils. Using a DTL coil with a tight MTL draw, or vice versa, throws off how quickly liquid reaches the coil and is a common, overlooked cause of spitback. Check your coil's resistance and airflow setting match the inhale style it's built for, and adjust the airflow dial to suit.
Quick answers
Does spitback mean my coil is broken?
Not usually. Spitback is almost always caused by how the device is being used, filled, or primed rather than a faulty coil. If a brand new coil spits from the very first draw, though, it's worth checking it's seated properly and hasn't been over-primed.
When should I replace my coil?
Most coils last one to two weeks with regular use, sooner with heavier daily vaping or sweeter, sugar-based e-liquids that can gunk up the cotton faster. A burnt taste, weaker flavour, or spitback that won't clear with cleaning are all signs it's time for a fresh one.
Can spitback damage my device?
Occasional spitback won't damage a well-maintained device. Persistent gurgling or leaking left unchecked can affect seals and internal contacts over time, so it's worth sorting the underlying cause rather than living with it.
Is it normal for a brand new coil to spit a little?
A little crackling on the first couple of draws after installing and priming a new coil is normal while any leftover priming liquid burns off. It should settle within a few puffs; if it doesn't, double-check you haven't over-primed it.
