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The short answer is no, not safely at the strengths nic salts are designed for. Here is why sub-ohm tanks and high-strength nic salts are incompatible and what you should use in each type of device instead.
Quick Answer: You should not use 10mg or 20mg nic salts in a sub-ohm tank. Sub-ohm tanks operate at high wattages and vaporise large amounts of e-liquid per puff. At these volumes, even 10mg nic salts deliver an unsafe amount of nicotine very rapidly, causing dizziness, nausea and a racing heart. If you use a sub-ohm device, use freebase e-liquid at 3mg or 6mg in a high-VG shortfill instead. The only exception is very low-strength nic salts (3mg or 5mg) used carefully at reduced wattage.
A sub-ohm tank uses a coil with a resistance below 1.0ohm, typically in the range of 0.15ohm to 0.5ohm, at wattages of 30W to 100W or more. At these settings, each puff produces a large volume of dense vapour. This is exactly what sub-ohm vaping is designed to do: create big clouds, intensify flavour and provide an immersive direct-to-lung experience.
The problem with nic salts in this setup is straightforward. A 20mg nic salt contains 20 milligrams of nicotine per ml. In a sub-ohm tank vaporising large quantities of e-liquid per puff, even a few draws delivers the nicotine equivalent of multiple cigarettes in seconds. The body cannot metabolise this quickly enough and the result is nicotine overconsumption: dizziness, nausea, headaches, shaking and a rapid heartbeat.
Beyond the nicotine issue, the thin 50/50 VG/PG ratio of nic salt e-liquid is not compatible with sub-ohm coils designed for thick, high-VG liquid. The thinner liquid wicks too fast through the large coil, leads to leakage and fails to deliver the thick vapour sub-ohm coils are built to produce.
At 20mg nic salt in a high-wattage sub-ohm setup, a few draws deliver an extreme amount of nicotine in a very short time. Symptoms include dizziness, nausea, a racing heartbeat, shaking and a cold sweat. This is nicotine overconsumption. If this happens, stop vaping immediately, sit down and drink water. Symptoms usually pass within 20 to 30 minutes.
Sub-ohm coils have large wicking ports designed for thick, high-VG liquid at 70/30 or higher. The 50/50 VG/PG ratio of nic salt e-liquid is much thinner. In a sub-ohm tank this thin liquid floods through the wicking ports and leaks into the airflow system, making a mess and potentially reaching the battery housing in a mod.
Nic salt e-liquid is smooth in a low-wattage pod kit because the vapour temperature and volume are controlled. In a sub-ohm setup running at 60W or more, the same liquid is heated aggressively and produces a large vapour volume that overwhelms the smooth salt formulation, often resulting in a harsh, uncomfortable inhale.
Sub-ohm coils run at high temperatures designed for viscous high-VG liquid that provides consistent wicking. The thinner 50/50 nic salt liquid wicks too rapidly through these coils, cannot keep up with the heat and causes the cotton wick to burn. A burnt coil produces an unpleasant taste and must be replaced.
The correct e-liquid for your device depends on its coil resistance and operating wattage. This table covers the most common setups UK vapers use.
| Device | Typical Wattage | Coil Resistance | Correct E-Liquid |
|---|---|---|---|
| Refillable pod kit (MTL) | 8W to 18W | 0.8ohm to 1.4ohm | Nic salt 10mg or 20mg (50/50) |
| MTL vape pen / starter | 8W to 15W | 1.0ohm to 1.8ohm | Nic salt 10mg or 20mg (50/50) |
| RDL pod / pen | 15W to 25W | 0.5ohm to 0.8ohm | Nic salt 5mg max or freebase 6mg to 12mg (50/50) |
| Sub-ohm tank | 30W to 80W | 0.15ohm to 0.4ohm | Freebase 3mg to 6mg in 70/30 shortfill only |
| High-power box mod | 50W to 200W+ | 0.1ohm to 0.3ohm | Freebase 3mg to 6mg in high-VG shortfill only |
If you use a pod kit or MTL device, our full range of TRPR-compliant nic salts is available online or from our store in Wolverhampton. Not sure which is right? Call us on 01902 444090 for advice.
At very low strengths (3mg or 5mg) in a sub-ohm setup running at moderate wattage (25W to 40W), some vapers do use nic salt e-liquid. At these low concentrations the nicotine overload risk is significantly reduced. The thinner 50/50 base still causes some leakage risk in most sub-ohm tanks designed for 70/30 or higher-VG liquid, so this combination is still not ideal.
The practical advice for anyone using a sub-ohm tank who wants the smoothness of nic salts is to use a nic salt shot instead of a ready-to-vape nic salt. A nic salt shot added to a high-VG 100ml shortfill creates a 70/30 or 80/20 blend at 3mg to 5mg, which is compatible with most sub-ohm coils and gives the smoother salt formulation without the nicotine overload or leakage risks.
Our complete guide library covers every question about nic salts for UK vapers. Strengths, devices, safety, comparisons and more.
Stop vaping immediately if you feel dizzy, nauseous or notice a racing heartbeat. These are signs of nicotine overconsumption. Sit down, drink water and rest. Symptoms typically pass within 20 to 30 minutes. Rinse the tank and fill it with the correct e-liquid (freebase at 3mg or 6mg in a 70/30 blend) before using it again.
At 3mg the nicotine overload risk is low but the 50/50 VG/PG ratio of most nic salt e-liquids is still not ideal for sub-ohm coils designed for 70/30 liquid. You may experience leakage or dry hits. For the best experience in a sub-ohm device, use a 70/30 or 80/20 freebase e-liquid at 3mg or 6mg rather than a 50/50 nic salt at the same strength.
If your mod supports coils above 0.8ohm and can run at 10W to 15W, then nic salts at 10mg can be used with care. The key factor is always the coil resistance. A 1.0ohm MTL coil at 12W in a mod is a safe setup for 10mg nic salts. A 0.3ohm coil at 15W is not, regardless of how low you set the wattage. For more detail, read our guide on Using Nic Salts in a Mod.
Visit Vapers Pantry at 39 Birmingham New Road, Wolverhampton, WV4 6BL for in-store guidance from experienced vapers. Alternatively call us on 01902 444090 and our team will advise on the correct e-liquid format and strength for your specific setup.