Yes, lead has been found in e-cigarette aerosol, and in some devices the levels are alarmingly high. Roughly 30% of vaping products tested in one North American study contained measurable amounts of lead, with concentrations varying dramatically depending on the device type and brand. The worst offenders are certain disposable vapes, where researchers have traced the contamination to metal alloys used in the device’s internal components.
Where the Lead Comes From
The lead in vapes doesn’t come from the e-liquid itself. It leaches into the liquid from metal parts inside the device. A 2025 study published in ACS Central Science pinpointed the source in one popular disposable brand, Esco Bar: the manufacturer used leaded bronze, an alloy containing up to 39% lead, in the coil sheaths that channel e-liquid toward the heating element. The battery connector wires, which also contact the liquid, were composed of roughly 19% lead. As e-liquid sits against these components, lead dissolves into it and is then inhaled as aerosol.
This is not a heating problem. The contamination happens through direct chemical contact between the liquid and lead-containing metal parts, which means it occurs whether the device is actively firing or just sitting in your pocket. In fact, “aged” e-liquids that had been sitting inside Esco Bar devices contained extraordinarily high lead concentrations, up to 175,000 micrograms per kilogram. The longer the liquid soaks against those alloys, the more lead it absorbs.
How Much Lead Reaches You
The amount varies enormously by device. In the Esco Bar devices tested, lead concentrations in aerosol ranged from about 3,850 to 51,900 micrograms per kilogram across different puff intervals. These levels were significantly higher than every other device tested across the full range of 100 to 1,500 puffs. To put that in perspective, UC Davis researchers calculated that one of the disposable e-cigarettes they studied released more lead during a day’s typical use than nearly 20 packs of traditional cigarettes.
Across a broader survey of products from Canada and the United States, open-wick style devices averaged 117.5 parts per billion of lead, while cartridge-based systems averaged just 14.7 ppb. Disposable devices as a category had higher lead levels than bottled e-liquids sold for refillable systems, which makes sense: with refillable setups, the liquid spends less time in contact with device metal before you inhale it.
Lead Levels in Vapers’ Blood
The contamination isn’t just theoretical. A large study using data from South Korea’s national health survey found that e-cigarette users had blood lead levels 10% higher than nonsmokers. They also had 61.4% higher cadmium levels and 13.7% higher mercury levels, reflecting exposure to multiple toxic metals, not just lead.
What surprised researchers is that e-cigarette users actually showed higher heavy metal levels than traditional cigarette smokers, despite the common assumption that vaping produces a “cleaner” exposure. People who used both e-cigarettes and traditional cigarettes had the highest metal levels of any group.
Why Disposable Vapes Are the Biggest Concern
Disposable vapes present a unique risk because they’re manufactured as cheaply as possible, often with little regulatory oversight over material choices. The use of leaded bronze in Esco Bar’s internal components, for instance, appears to be a cost-cutting decision. Bronze alloys containing lead are easier to machine and less expensive than lead-free alternatives, but they’re wholly inappropriate for a device that delivers aerosolized liquid into someone’s lungs.
The lead emissions from these devices stayed fairly consistent throughout their lifespan. Between 100 and 300 puffs, lead output held roughly steady, meaning users don’t “burn off” the contamination early on. You’re inhaling lead from start to finish. And because disposable vapes are sealed units, there’s no way to inspect, clean, or replace the internal parts responsible for the contamination.
What Lead Inhalation Does to Your Body
There is no safe level of lead exposure. Unlike many toxins where the body can tolerate small amounts, lead accumulates in bones and soft tissue over time. Inhaled lead is particularly efficient at entering the bloodstream because the lungs absorb it more readily than the digestive tract does.
Chronic low-level lead exposure is linked to kidney damage, high blood pressure, reproductive problems, and cognitive decline. In younger people, whose brains are still developing, even modest increases in blood lead can affect memory, attention, and learning. The 10% elevation in blood lead seen in e-cigarette users may sound small, but lead’s health effects operate on a no-threshold model: any increase adds risk, and the damage compounds over years of use.
Not All Devices Are Equal
The research makes clear that lead contamination is not uniform across the vaping market. Cartridge-based systems tested at roughly one-eighth the lead levels of open-wick devices. Bottled e-liquids intended for refillable tanks contained significantly less lead than liquid pulled from disposable devices. And certain brands, like Esco Bar, tested far worse than others due to specific material choices in their manufacturing.
The core problem is that no consistent standard governs which metal alloys can be used in vape construction. Without mandatory testing or material restrictions, consumers have no way to know whether the device they’re using contains lead-bearing components. The contamination is invisible, odorless, and tasteless. You won’t know it’s there unless someone runs the device through a lab.