How to Mix Nic Shots with JUSTVAPE 100ml Safely and Effectively
Two 10ml shots into a 100ml shortfill gives you 120ml of ready-to-vape e-liquid at the strength you want. Here is the UK 2026 guide to doing it right, with strength tables and a clean shake.
Two 18mg freebase shots = 3mg. Two 20mg nic salt shots = 3.3mg. Shake 30 seconds, rest 5 minutes, vape.
For 0mg, don’t add anything. For higher than 3mg, decant some shortfill liquid first to fit a third shot. Above 6mg flavour gets too diluted.
Pick up JUSTVAPE 100ml and your shots together
Buy a 100ml JUSTVAPE 50/50 shortfill and matching 18mg freebase or 20mg nic salt shots in the same order. In store advice in Omagh and Strabane on which shot type matches your kit, or free UK delivery on orders over £50.
The maths behind a 100ml shortfill mix
A “100ml shortfill” is a 120ml bottle with 100ml of nicotine-free e-liquid in it. The 20ml of headroom is there for exactly two 10ml nic shots. Adding both gives you a finished 120ml bottle of ready-to-vape e-liquid.
The reason the format exists is the UK TPD rule that caps nicotine-containing e-liquid at 10ml per bottle. Sell the flavour base at 0mg in a big bottle, sell the nicotine separately in a 10ml shot, and the consumer mixes the two. That’s how UK manufacturers sell 100ml of flavour without breaking the law.
The maths is straightforward once you know the formula: (nic shot strength × number of shots) ÷ total final volume = final strength. Two 18mg shots in 100ml works out to (18 × 2) ÷ 120 = 3mg. That single calculation is why 3mg is the standard everyday strength for 100ml shortfills.
Strength conversion table
The numbers most JUSTVAPE 100ml customers ask about at the counter:
- 0 shots = 0mg nicotine (vape as-is from the bottle)
- 1 × 18mg freebase shot = 1.6mg in 110ml
- 2 × 18mg freebase shots = 3mg in 120ml (most common)
- 2 × 20mg nic salt shots = 3.3mg in 120ml (smoother)
- 3 × 18mg freebase shots = 4.5mg (requires decanting 10ml first)
- 4 × 18mg freebase shots = 6mg (requires decanting 20ml first, flavour gets diluted)
Freebase shots vs nic salt shots
Both work in JUSTVAPE 100ml. Freebase nic shots (18mg) are the standard choice for shortfill mixing and give a sharper throat hit at low concentrations. Nic salt shots (20mg) give a smoother hit and faster nicotine delivery and are particularly worth considering if you are using JUSTVAPE 100ml in a low-power MTL pod kit. Most ex-smokers prefer nic salt shots, most ex-freebase users prefer freebase out of familiarity. Our device pairing guide covers which combination works best for your kit.
VG/PG ratio matters more than people think
Match the VG/PG ratio of your nic shot to the shortfill. JUSTVAPE 100ml is 50/50, so use 50/50 nic shots (both freebase and salt versions are sold as 50/50). Adding a high-VG (70/30 or 80/20) shot to a 50/50 shortfill changes the final ratio and can affect coil performance. Most UK retailers including Just Vape stock 50/50 shots specifically for this reason.
2 × 18mg freebase = 3mg
The standard everyday mix. 120ml of 3mg 50/50 e-liquid ready for any MTL or RDL pod kit. Lasts 3 to 4 weeks for most vapers.
2 × 20mg salt = 3.3mg
Smoother throat hit, faster nicotine delivery. Slightly stronger at 3.3mg. Best with low-power MTL pod kits at 12 to 18W.
Mismatched VG/PG shots
Adding a 70/30 high-VG shot to a 50/50 shortfill changes the final ratio. Use 50/50 shots with JUSTVAPE 100ml every time.
Above 6mg final strength
3+ shots dilute the flavour and produce a harsh vape. If you want higher than 6mg, use a 10ml ready-mixed bottle instead.
The clean 4-step mix
The order matters. Add the shots first, then shake, then rest, then fill the pod. Skipping the rest step gives air bubbles in the pod and can cause leaks on first use.
Open both bottles
Twist off the child-resistant cap, then remove the inner nib. New shortfills are tight, so a shortfill opener tool or the edge of the outer cap will lever the nib off.
Pour the shots in
Remove the nib from each nic shot, then squeeze the full 10ml into the shortfill bottle. Repeat with the second shot. Wipe up any spills immediately.
Replace the nib and shake
Click the inner nib back firmly. Screw the outer cap back on. Shake vigorously for 30 seconds. The liquid should look uniform with small bubbles.
Rest 5 minutes, then fill
Let the bottle sit for 5 minutes for bubbles to settle and the mix to blend. Then fill your pod and prime the coil for another 5 minutes before vaping.
Label the bottle with the final nicotine strength and the date you mixed it. Store mixed bottles upright, out of direct sunlight and away from heat. Always keep nic shots and mixed bottles out of reach of children and pets, ideally in a locked drawer. Never decant into food or drink containers. For more on the day-to-day, our all-rounder guide covers why JUSTVAPE 100ml suits both new and experienced vapers.
JUSTVAPE 100ml Consumer Guides hub
Nic shot mixing, device pairing, flavour rankings, cost comparison and the 50/50 all-rounder explainer.
For the wider picture of how 100ml shortfills sit in the UK 2026 vape market and what the October 2026 Vaping Products Duty means for shortfill prices, the JUSTVAPE 100ml Consumer Guides hub covers everything from format basics to long-term value vs 10ml bottles. Built on a decade of in-store experience at Omagh and Strabane helping customers mix their own at sensible strengths.
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Frequently asked questions
How many nic shots do I need for a 100ml shortfill?
What is the difference between freebase and nic salt shots?
Can I add more than 2 nic shots to JUSTVAPE 100ml?
How do I open a JUSTVAPE 100ml shortfill bottle?
How long do I need to shake the bottle after adding nic shots?
Is mixing nic shots safe at home?