Same compound. Different chemistry. Salts smoother at higher strength.

Both contain the same nicotine compound but in different chemical forms. Freebase nicotine is nicotine in its pure alkaline form: harsher throat hit, slower absorption, typically used at lower strengths (3-12mg). Nicotine salts are freebase nicotine combined with an organic acid (usually benzoic acid): lower pH, smoother at higher strengths, faster absorption more similar to cigarettes, typically used at higher strengths (10-20mg). Both fall under the same UK 20mg/ml maximum. Each suits different users plus devices. For smokers switching, nicotine salts often provide smoother higher-strength transition. Here is the full comparison plus how to choose. This article is general consumer information, not medical advice.

What is freebase nicotine?

Traditional form of nicotine used in e-liquids since vape emerged:

Chemistry.

• Pure nicotine alkaloid.
• Alkaline pH (around 8-9).
• Nitrogen-containing compound.
• Freely available form of the molecule.

Experience.

• Noticeable throat hit particularly at higher strengths.
• Can be harsh over around 12mg.
• Slower absorption than salts.
• Less sharp acute peaks.

Typical strengths.

• 3mg (very light).
• 6mg (light).
• 12mg (medium).
• 18mg (higher, can be harsh).
• Rarely above 18mg due to harshness.

Device compatibility.

• Works with most vape devices.
• High-powered sub-ohm devices suit lower strengths (3-6mg).
• Lower-powered MTL devices can use higher strengths (12-18mg).
• Traditional choice for most vape setups.

Cost.

• Generally cheaper per ml than salts.
• Shortfill format (0mg base you add nicotine shot to) common.
• Wide variety of products.

What are nicotine salts?

Newer formulation developed around 2015:

Chemistry.

• Nicotine combined with organic acid (usually benzoic acid).
• Lower pH (around 6-7, closer to neutral).
• Same nicotine compound but bonded differently.
• More stable chemical form.

Experience.

• Smooth even at higher strengths.
• Less throat irritation.
• Faster absorption closer to cigarette.
• Sharper acute nicotine peak.
• More satisfying hit for heavy smokers.

Typical strengths.

• 10mg (moderate).
• 15mg (higher).
• 20mg (UK maximum).
• Rarely below 10mg (freebase preferred there).

Device compatibility.

• Best with pod systems.
• Lower-wattage MTL devices.
• Not suitable for high-powered sub-ohm (would deliver too much nicotine).
• Most modern pod kits optimised for salts.

Cost.

• Slightly more expensive per ml than freebase typically.
• Usually sold as 10ml nic-containing bottles (UK TPD).
• Wide range of flavours.

The chemistry explained

Why do these forms behave differently at the molecular level?

pH and absorption.

• Freebase (alkaline): nicotine in deprotonated form.
• At higher pH, nicotine more vapour-phase.
• Harsh sensation in throat.
• Absorbed more slowly.
• Salts (near-neutral): nicotine in protonated form.
• Easier absorption across membranes.
• Smoother sensation.
• Faster blood nicotine peak.

Why acids matter.

• Organic acids (benzoic, citric, lactic) combine with freebase nicotine.
• Creates stable nicotine-acid salt.
• Lower pH solution.
• Allows higher strength without harshness.
• Mimics cigarette pH (also slightly acidic).

Delivery profile difference.

• Freebase: gradual peak over several minutes.
• Salts: sharper peak closer to cigarette pattern.
• Both reach similar blood levels ultimately.
• Speed plus pattern differ.

Comparison with cigarettes

Why does cigarette nicotine delivery matter?

Cigarette nicotine profile.

• Slightly acidic pH (tobacco naturally).
• Fast absorption (10-20 seconds to brain).
• Sharp peak.
• Rapid decline.
• Highly reinforcing delivery pattern.

Freebase nicotine profile.

• Slower absorption than cigarettes.
• More gradual peak.
• Works for most vapers but less satisfying for heavy smokers.

Nicotine salts profile.

• Close to cigarette absorption.
• Faster peak than freebase.
• More satisfying hit for heavy smokers.
• Better replicates cigarette experience.

This is why nicotine salts emerged. Heavy smokers switching to vape needed higher-strength nicotine with cigarette-like delivery. Freebase at high strengths was too harsh. Salts solved this by providing 20mg smoothly.

Experience differences: what users notice

Throat hit.

• Freebase: noticeable hit particularly above 6mg.
• Salts: much smoother across all strengths.
• Preference varies: some like throat hit, some prefer smooth.

Satisfaction for heavy smokers.

• Freebase 6mg may feel insufficient for heavy smokers.
• Freebase 18mg often too harsh.
• Salts 20mg provides strong satisfying hit smoothly.
• Key reason salts dominate switching market.

Cloud production.

• Similar between forms at same PG/VG ratio.
• Device plus coil matter more than nicotine form.

Craving relief.

• Salts: faster craving relief similar to cigarettes.
• Freebase: slower gradual relief.
• Heavy smokers often prefer salts for this reason.

Flavour perception.

• Salts: flavour sometimes perceived as sweeter.
• Freebase: flavour can be masked by throat hit.
• Individual perception varies.

Which users suit each form

Nicotine salts suit:

• Smokers switching, particularly heavy smokers.
• Those wanting cigarette-like satisfaction.
• Pod system users.
• Those finding freebase harsh.
• Those needing higher nicotine strength (over 12mg).
• Those preferring smoother hit.
• MTL (mouth-to-lung) vapers.

Freebase suits:

• Lower-strength vapers (3-6mg).
• Sub-ohm device users.
• DTL (direct-to-lung) vapers.
• Those liking throat hit.
• Long-term vapers who have tapered down.
• Those with specific flavour preferences better in freebase.
• Cloud-chasers.

How to choose your strength

Matching nicotine to your usage pattern:

Current heavy smoker (20+ cigarettes/day).

• 20mg nicotine salts usually appropriate.
• Pod system.
• Match cigarette nicotine intake for effective switch.

Moderate smoker (10-20/day).

• 10-20mg nicotine salts typically.
• Pod or MTL device.
• Start at higher end if strong cravings.

Light smoker (under 10/day).

• 6-10mg salts or 12mg freebase.
• Pod or MTL device.
• Some do well at lower salts strength.

Social smoker or occasional.

• 3-6mg freebase often appropriate.
• Or 6mg salts.
• MTL device.

Long-term vaper stepping down.

• Gradually decrease strength.
• Our range covers every UK legal strength for systematic step-down.
• Eventually 3mg freebase or 0mg as cessation approaches.

If you experience harshness.

• Try lower strength.
• Try salts if using freebase.
• Check device setup.

If cravings not satisfied.

• Try higher strength (within UK maximum).
• Try salts if using freebase.
• Check device is delivering adequately.

Addictiveness considerations

Important note on salt form plus addiction:

Both addictive.

• Same nicotine compound.
• Same fundamental addiction mechanism.
• Same dependence potential.
• UK regulations apply equally.

Salt delivery pattern.

• Faster peak closer to cigarettes.
• Slightly more reinforcing delivery profile.
• Not fundamentally different addiction.
• Cigarettes were already this profile.

Youth appeal concern.

• High-strength salts smoother than freebase.
• Less noticeable throat hit for first-time users.
• Contributed to youth vape uptake concerns.
• UK maximum 20mg addresses some of this.
• UK 18+ law applies fully.

UK regulatory status

Both forms equally regulated under UK TPD:

• 20mg/ml maximum nicotine strength.
• 10ml maximum bottle size for nicotine products.
• MHRA product registration required.
• Child-resistant packaging.
• Ingredient disclosure.
• 18+ age of sale.
• Banned substances same for both.

No regulatory preference for one over the other. Both are legitimate legal vape products.

Transition between forms

If you want to switch from freebase to salts or vice versa:

Freebase to salts:

• Common transition when original strength feels insufficient.
• Start at equivalent or slightly lower strength.
• E.g. from 12mg freebase to 10mg salts initially.
• Adjust based on satisfaction.
• Different device may be needed.

Salts to freebase:

• Common step-down pathway.
• Step down to 12mg or 6mg freebase.
• May feel harsher initially.
• Supports progressive reduction toward cessation.

Mixing forms.

• Possible if user wants specific combination.
• Not usually needed.
• May complicate step-down tracking.

Practical approach

• Both contain same nicotine compound. Different chemical form.
• Salts: smoother at higher strengths. Better for heavy smokers switching.
• Freebase: stronger throat hit. Better at lower strengths plus with high-powered devices.
• UK 20mg/ml limit applies to both. Same regulatory framework.
• Match to usage pattern plus device. No universal best.
• Salts dominate pod systems. Freebase dominates sub-ohm.

For smokers switching, our nicotine salts collection covers every UK compliant strength from 20mg down to 3mg supporting effective transition plus step-down over time.

For the wider view on vape, nicotine plus choosing products questions, our full health hub covers every major question UK readers ask.