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Vape nicotine strength labels, decoded — mg/mL, percentages and what they mean
Pick up three different vape products and you might see three different ways of labelling nicotine strength — a percentage, a "mg" number, or "mg/mL". None of it is intuitive unless someone explains it, and that confusion makes it easy to underestimate exactly how much nicotine you're using, or to compare products in a way that feels informed but actually isn't.
The two main labelling systems
Most vape liquids and pods use one of two conventions. The first is milligrams per millilitre (mg/mL), which tells you the concentration of nicotine in the liquid itself — a 20 mg/mL liquid has more nicotine per drop than a 6 mg/mL one. The second is percentage strength, common on pod-style devices and disposables, where "5%" means roughly 50 mg/mL. The two systems describe the same thing in different units, but because they look so different on packaging, people regularly assume a "5%" pod is somehow milder than a "50 mg" one, when they're describing the same strength.
Why the total dose matters more than the label
A strength label only tells you the concentration, not how much you actually inhale. A device with a bigger tank, a more powerful heating coil, or a habit of longer and more frequent puffs can deliver far more total nicotine over a day than the percentage alone suggests. This is part of why comparing devices purely by their printed strength can be misleading — two people using "the same" nicotine percentage can end up with very different real-world exposure depending on the hardware and how often they puff.
Where high-strength products fit in
Regulatory limits vary by country, but many markets cap nicotine concentration in vape liquids well below what some disposable and pod products claim, and enforcement isn't uniform everywhere. Newer users in particular often start on stronger products than they realise, because a high number on a colourful, fruit-flavoured disposable doesn't read as "strong" the way a pack of cigarettes does. Someone who has never smoked at all may have no reference point at all for what a given nicotine strength actually feels like, which makes it even easier to end up dependent on a stronger product than intended.
Using the label to make an informed choice
If you're trying to understand or reduce your own nicotine exposure, start by simply checking the number on what you already use — many people have never actually looked. From there, a gradual step down in concentration, done deliberately rather than by chance, tends to be more sustainable than switching products at random. Writing the number down somewhere, rather than trusting memory, also makes it easier to notice if you quietly switch to a stronger product without meaning to. If you're managing a health condition or find withdrawal symptoms difficult, a doctor or pharmacist can help you plan a reduction that fits your situation.
Sources: US Food and Drug Administration (FDA) on e-cigarette nicotine content; World Health Organization on e-cigarette regulation; UK National Health Service (NHS) on vaping products.