Vape explosions are rare but not as rare as you might assume. From 2015 to 2017, an estimated 2,035 e-cigarette explosion and burn injuries sent people to U.S. emergency departments. That works out to roughly 700 ER visits per year during that period, with a peak of about 1,000 visits in 2016 alone. Before that, from 2009 to 2016, media outlets documented 195 explosion incidents in the U.S., resulting in 133 injuries.
To put those numbers in perspective, tens of millions of Americans were using vapes during those years. The odds of any single device exploding are extremely low. But when it does happen, the injuries can be severe, and the circumstances are often preventable.
What Actually Happens During an Explosion
Vapes run on lithium-ion batteries, the same type found in phones and laptops. The difference is that vape batteries are packed into a small, tube-shaped device with limited ventilation. When something goes wrong, a process called thermal runaway begins: the liquid electrolyte inside the battery overheats, pressure builds inside the sealed cell, and eventually the seal breaks. Once the electrolyte is exposed to air, it can ignite, creating rapid gas expansion and, in a confined space, an explosion.
The result isn’t just heat. The battery contains alkaline lithium salts that can cause chemical burns on top of the thermal burns from the fire itself. This combination is what makes vape explosions particularly damaging compared to a simple fire.
Where Injuries Typically Occur on the Body
The location of the injury depends on where the device was when it failed. In a study of 46 patients with vape explosion injuries, 69% had burns to the waist or groin area, 25% had hand injuries, and 7% had facial injuries. The groin pattern is strikingly common because most people carry their vape in a front pants pocket, and that’s often where the battery fails.
These aren’t minor burns. In the same study, 85% of patients had deep partial-thickness burns (meaning damage extending well below the skin’s surface), and 17% had full-thickness burns that destroyed the entire depth of the skin. Hand injuries typically happen when someone tries to pat out a fire on their clothing or when the device explodes while being held. Facial injuries, while less common, occur when the device fails during use.
Why Batteries Fail
Most vape explosions trace back to a handful of preventable causes. The battery can overheat from overcharging, from being punctured or physically damaged, from exposure to high temperatures (like sitting on a car dashboard in summer), or from a short circuit. Short circuits are especially common when loose batteries are carried in a pocket alongside metal objects like keys or coins, which can bridge the battery’s positive and negative terminals.
The type of device matters significantly. Mechanical mods (sometimes called “mech mods”) are unregulated devices with no internal circuitry between the battery and the heating coil. There is no chip monitoring the battery’s voltage, no automatic shutoff when the battery gets too low, and no protection against drawing too much current. The atomizer accepts power even when the battery is dangerously depleted. Regulated mods, by contrast, have a circuit board that controls electricity flow and includes built-in protections against overheating and over-discharge. This distinction is one of the biggest risk factors that’s actually within a user’s control.
Who Is Most at Risk
Users of mechanical mods and those who build custom coil setups face the highest risk because they’re bypassing the safety systems that prevent thermal runaway. People who use mismatched chargers, carry loose batteries without a protective case, or charge their devices overnight on flammable surfaces also increase their odds of an incident. Cheap, no-name devices without any safety certification are another significant risk factor, since they may use lower-quality battery cells with thinner separators that are more prone to failure.
How to Reduce the Risk
A few straightforward precautions eliminate most of the common failure scenarios:
- Use the charger that came with your device. A higher-amperage charger generates extra heat that degrades the battery over time. Never charge with a random USB cable plugged into a high-output adapter.
- Never carry loose batteries in your pocket. Metal objects like keys or coins can connect the positive and negative ends and trigger a short circuit. Use a plastic battery case, which costs almost nothing.
- Store batteries in a cool, dry place. Heat accelerates battery degradation. A hot car interior is one of the worst places to leave a vape.
- Replace damaged batteries immediately. If the plastic wrap around a battery is torn, nicked, or peeling, the exposed metal can cause a short. Rewrap it or replace it.
- Choose regulated devices over mechanical mods. The built-in circuit board acts as a safety net, cutting power before the battery reaches dangerous conditions.
Safety Standards Are Still Catching Up
UL Solutions (formerly Underwriters Laboratories) has developed a safety standard called UL 8139, which evaluates the electrical, heating, battery, and charging systems of vaping devices. It tests how devices respond to electrical stress, mechanical damage, accidental activation, and worst-case battery failure scenarios. The standard is recognized by both the American National Standards Institute and the Standards Council of Canada.
However, compliance is voluntary for manufacturers, and a large portion of devices on the market, particularly those sold online from overseas suppliers, have never been tested against any safety standard. If your device carries a UL or similar certification mark, it has at least been evaluated for basic electrical safety. If it doesn’t, you’re relying entirely on the manufacturer’s quality control, which may be minimal.