The first question every vaper asks about oral nicotine is which strength to buy. The honest answer is that nobody can give you an exact number, and anyone offering a clean conversion formula is guessing.

What you can do is start in a sensible place and adjust. This guide sets out how.

Why there is no clean conversion

The number on an e-liquid bottle is a concentration, not a dose. 20mg/ml tells you how much nicotine is in each millilitre of liquid. It says nothing about how much liquid you get through, how much nicotine survives the coil, or how much of it your body takes up.

Two people on identical 20mg/ml pods can be a long way apart. One finishes a 2ml pod every day. The other takes three weeks over the same pod. Their daily intake is not comparable, and neither is the oral strength that would suit them.

Absorption differs too. Inhaled nicotine reaches you quickly through the lungs. Oral nicotine crosses the lining of your mouth more slowly and less completely, so an 8mg melt does not land like 8mg of e-liquid. The shape of the curve is different, not just the size.

So what follows is a starting point built on how you actually vape, not a pharmacological equivalence.

Start with how often you reach for it

Frequency tells you more than the number on the bottle. Before you look at anything else, answer this: how many times do you reach for your vape before lunch?

How you vape Typical device Suggested start
A few times, mostly with a coffee or after eating Any, often 10mg/ml or lower Lowest strength available
Every hour or so, in defined sessions 10 to 20mg/ml salt pod, or sub-ohm at 3 to 6mg/ml Mid strength
Constantly, without thinking about it 20mg/ml salt pod or disposable, one or more a day Highest strength available

For NYXE, launching in 4mg and 8mg, that maps to 4mg for the first two rows and 8mg for the third. Products that stop at 1mg or 2mg will suit the first row and leave the third row reaching for tablets more often.

Then sanity-check against your liquid

Use this as a cross-check rather than a calculation.

A 20mg/ml nicotine salt pod or disposable is the high end of UK vaping. It is designed to deliver a lot of nicotine in a small number of puffs, which is why it suits people who vape in short, frequent bursts. If this is you, start at the top of whatever oral range you are buying into.

Sub-ohm setups running 3 to 6mg/ml freebase look lower on paper, but the volume is far higher. Someone getting through 8ml a day at 3mg/ml is taking in more nicotine than someone nursing 2ml a day at 20mg/ml. Do not read the concentration alone.

If you genuinely do not know what strength you vape, you are almost certainly not a heavy user, and the middle of the range is the right place to start.

What to expect in the first week

Oral nicotine feels different, and the first few days are not a fair test.

The delivery is slower. There is no throat hit from vapour, and no instant arrival. Products formulated with cooling agents recreate part of that sensation, but it is not identical and it is not supposed to be.

You will probably use more than you expect at first, because the habit is tuned to a device that is always available. That settles. Give it a week before you decide the strength is wrong.

If you feel light-headed, queasy or notice your heart racing, that is too much nicotine. Stop, wait, and go down a strength. That is the same signal it would be with any nicotine product.

Adjusting

Once you have a week behind you, you have real information.

If you are getting through the pack faster than you expected and still thinking about your vape, the strength is too low for you rather than the format being wrong. Go up if there is room in the range.

If one is lasting longer than you want it to, or you feel it too strongly, go down. Stepping down inside the same product is easier than switching product, which is why ranges that span several strengths are useful.

Either way, change one thing at a time. Changing strength and flavour and format together tells you nothing about which one caused what.

The short version

Pick by frequency, not by the number on your e-liquid. Heavy, unconscious, all-day vaping points to the strongest option available. Occasional use points to the lowest. Give it a week before judging, and step rather than jump.

If you want a starting point based on your own answers rather than a table, the NYXE Vape Profiler asks seven questions and suggests a strength at the end.

NYXE is a nicotine-containing product. For adults only. Not for non-nicotine users, pregnant women, or those with underlying health conditions without medical advice.