The nicotine percentage on a vape label tells you how concentrated the e-liquid is: multiply the percentage by 10 to get milligrams of nicotine per milliliter (mg/mL). A 5% vape holds about 50 mg/mL, and a 2% vape holds about 20 mg/mL.
This guide explains how to read that number, how nicotine salt differs from freebase nicotine, where nicotine comes from, and how Zavro labels its own products. Zavro products contain nicotine, which is an addictive chemical, and are for adults 21+.
What does the nicotine percentage on a vape mean?
The percentage is the share of the e-liquid that is nicotine, and it converts to mg/mL at roughly 1% = 10 mg/mL. US labels often state the percentage by weight, so treat the mg/mL figure as an approximation rather than an exact lab value.
Percentages and mg/mL are two ways of writing the same thing. Disposables and pod systems in the US tend to use percentages, while refillable bottles tend to use mg/mL. The table below shows the common conversions.
| Label percentage | Approximate mg/mL | Where you commonly see it |
|---|---|---|
| 2% | 20 mg/mL | Pod systems and disposables |
| 3% | 30 mg/mL | Pod systems and disposables |
| 5% | 50 mg/mL | Disposables and pod systems |
The number describes concentration, not the total amount in a device. A device that holds more e-liquid holds more total nicotine at the same percentage. Likewise, a higher-strength liquid delivers more nicotine in each puff than a lower-strength liquid at the same puff size.
For a closer look at the conversion between 5% and 2%, see our comparison of 5% vs 2% nicotine.
Is 5% nic salt the same as 50mg?
Yes, approximately. A 5% nicotine salt label corresponds to about 50 mg/mL, using the standard rule that 1% is about 10 mg/mL.
The same conversion works for other strengths. A label that says 20 mg/mL is the same concentration as 2%. The units differ, but the concentration does not. Because US labels often list percent by weight, the exact mg/mL can drift slightly from the round number, which is why we call it approximate.
What is the difference between nicotine salt and freebase nicotine?
Freebase nicotine is nicotine in its unprotonated form, while nicotine salt is nicotine combined with an acid. The acid lowers the pH of the liquid, and that change is why salt formulas are used at higher concentrations.
Freebase is the form used in most bottled e-liquids for refillable kits, often at 3 to 12 mg/mL. Nicotine salt is used in pod systems and disposables at roughly 20 to 50 mg/mL. Many vapers describe salt nicotine as smoother at those higher strengths, though that is a description of preference, not a measured promise. Salt formulas also tend to pair with low-wattage devices.
| Freebase nicotine | Nicotine salt | |
|---|---|---|
| Form | Unprotonated nicotine | Nicotine combined with an acid |
| Typical strength | About 3-12 mg/mL | About 20-50 mg/mL |
| Common acids | Not applicable | Benzoic, levulinic, lactic, salicylic |
| Usually found in | Refillable kits | Pod systems and disposables |
| Typical device power | Higher wattage | Low wattage |
We cover the topic in more depth in What Is Salt Nicotine?
Where does vape nicotine come from?
Nicotine in a vape is either tobacco-derived, extracted from tobacco leaves, or synthetic, made in a laboratory from non-tobacco starting chemicals. Both are the same nicotine molecule.
Synthetic nicotine is often marketed as "tobacco-free" or TFN. That phrase describes the source, not the content: tobacco-free does not mean nicotine-free. A tobacco-free vape still contains nicotine, and it is still addictive.
Since April 14, 2022, US federal law (the Consolidated Appropriations Act, 2022) treats nicotine from any source, including synthetic, as a tobacco product regulated by the FDA. The same age rule of 21+ and the same marketing rules apply either way. The full comparison is in Synthetic Nicotine vs Tobacco-Derived Nicotine.
Does tobacco-free mean nicotine-free?
No. Tobacco-free means the nicotine was made synthetically rather than extracted from tobacco leaves. The product still contains nicotine.
Check the nicotine strength on the label, not the source claim, to know how much nicotine a product contains. A tobacco-free 5% product and a tobacco-derived 5% product have the same concentration of the same molecule.
How do Zavro products use nicotine?
Zavro Spur uses tobacco-free (synthetic) nicotine salt at 5%, and Zavro Edge uses tobacco-derived nicotine at 20 mg/mL. The two lines differ in format, strength and nicotine source.
Zavro Spur
Spur is a rechargeable disposable rated for 50,000 puffs, with an OLED screen that shows e-liquid and battery level. It is rechargeable over USB-C, uses a dual mesh coil, and has three power levels, the top one called Turbo. Its nicotine is nicotine salt from a tobacco-free (synthetic) source, sold at 5% today. A 2% strength goes on sale in December 2026. Spur comes in nine flavors. It is sold singly or in boxes of 5, and it is assembled in the USA. Browse the Spur collection or go straight to Zavro Spur 5%.
Zavro Edge
Edge is a prefilled pod system made of a rechargeable Edge battery and replaceable pods. Each pod holds 7 mL of e-liquid, is rated for about 10,000 puffs, and contains 20 mg/mL nicotine (2%) from tobacco-derived nicotine. Pods come in seven flavors. They are sold singly or in boxes of 10. See the Edge collection.
| Spur | Edge | |
|---|---|---|
| Format | Rechargeable disposable | Prefilled pod system |
| Nicotine strength | 5% (about 50 mg/mL); 2% from December 2026 | 20 mg/mL (2%) |
| Nicotine type | Nicotine salt | Not specified |
| Nicotine source | Tobacco-free (synthetic) | Tobacco-derived |
| Rated puffs | 50,000 | About 10,000 per pod |
How do you read a vape nicotine label?
Find the strength first, written as a percentage or in mg/mL, then check the nicotine type and source. Together those three details tell you what is in the device.
- Strength. Convert percentages to mg/mL by multiplying by 10. A 5% label is about 50 mg/mL.
- Type. Look for "salt" or "nic salt" versus freebase. Higher strengths in disposables and pods are normally salt.
- Source. Look for "tobacco-derived" or "tobacco-free" (synthetic). Neither means the product is free of nicotine.
- Volume. E-liquid volume, where stated, sets the total nicotine in the device. A pod listed at 7 mL and 20 mg/mL holds a different total than a device with another volume at the same strength.
- Rated puffs. Puff counts are manufacturer ratings under test conditions. Real counts vary with puff length, power mode and habits.
Strength is a personal choice that depends on how much nicotine you already use. If you are comparing a 5% device with a 2% device, remember that the percentage is concentration, so the same puff carries a different amount of nicotine.
Why does strength matter when comparing products?
Strength matters because the same label number can describe very different products once volume, form and format are considered. A fair comparison looks at concentration, total e-liquid volume and nicotine type together.
For example, a 20 mg/mL pod and a 20 mg/mL disposable have the same concentration, but each holds a different volume of e-liquid, so the totals differ. A salt liquid at 20 mg/mL and a freebase liquid at 20 mg/mL are also different formulations, even though the number matches. Compare like with like, and treat every mg/mL figure as approximate when the label states percent by weight.
Strength is also not a measure of quality. It is a statement of concentration. Nicotine is addictive at every strength, so the right choice depends on your own preference and how much nicotine you already use.
Frequently asked questions about vape nicotine
The most common questions come down to conversion and source. Percentages convert to mg/mL by multiplying by 10, salt and freebase are different forms of the same nicotine, and tobacco-free never means nicotine-free.
If you want to go deeper, start with salt nicotine or synthetic nicotine, then browse Spur and Edge to see how those labels apply to real products. All Zavro products contain nicotine, which is an addictive chemical, and are for adults 21+.