Nicotine Salts vs Freebase E-Liquids in Vapes

Key Takeaways

• Nicotine salts and freebase nicotine are the two main types of nicotine used in prescription vaping products in Australia – they feel and work differently, but both are used for smoking cessation.
• Nicotine salts contain a mild acid (typically benzoic acid) that makes the vapour smoother to inhale, even at higher nicotine concentrations.
• Freebase nicotine has no added acid, produces a stronger throat sensation, and is typically used at lower concentrations.
• Nicotine salts are absorbed into the body more quickly – making them more effective at managing sudden cravings, especially in the early stages of quitting.
• Under Australian TGA regulations, both formulations are regulated as medicines that can be accessed via an Australian pharmacy only.

If you have been prescribed a nicotine vaping product to help you quit smoking, you may have noticed that e-liquids come in two different types: nicotine salts and freebase nicotine. Understanding the difference can help you get the most out of your cessation programme. Quit Clinics provides access to TGA Authorised Prescribers who can advise which formulation is clinically appropriate for your situation.

What Are Nicotine Salts?

Nicotine salts are a form of nicotine that has been combined with a mild acid (most commonly benzoic acid) to make it easier to inhale at higher concentrations. In their natural state, high-strength nicotine liquids are quite harsh on the throat. This “throat-hit” is familiar and appeals to some long-term smokers, whereas other users, particularly those transitioning from black market disposable vapes find freebase too harsh to tolerate. Adding benzoic acid smooths that out, which means you can use a stronger product without the discomfort, and vape a smaller amount to receive the same nicotine dose.

The acid also helps your body absorb the nicotine faster. This quicker absorption is one of the reasons nicotine salts tend to be more effective at settling an intense craving as the nicotine reaches your bloodstream more rapidly, which is closer to what happens when you smoke a cigarette.

Black market disposable vapes almost exclusively contain nicotine salts, rather than freebase. Typically concentrations of black market vapes is 50mg/mL or higher. 

Nicotine salt e-liquids can only be legally supplied by an Australian pharmacy, and in most cases doses between 20mg/mL and 50mg/mL are used, which means that prescription is required. Quit Clinics provides same-day access to doctors who are TGA Authorised Prescribers of nicotine.

What Is Freebase Nicotine and How Does It Differ?

Freebase nicotine is the original, unmodified form of nicotine used in e-liquids. Without the acid used in nicotine salt products, freebase nicotine has a higher alkaline level. That’s what produces the familiar “throat hit” sensation when you inhale. At lower concentrations, many people find this perfectly manageable, but at higher strengths it becomes quite uncomfortable.

Because of this, freebase e-liquids are generally used at lower nicotine concentrations – typically between 3 mg/mL and 18 mg/mL. They are also absorbed into the body slightly more slowly than nicotine salts. This makes freebase products a reasonable option for people who are further along in their weaning programme, who have a lower level of nicotine dependence to begin with or find it easier to transition from cigarettes with the familiar “throat-hit”.

Freebase nicotine is typically used with devices that produce a larger amount of vapour, which partly compensates for the lower concentration. Under Australian TGA regulations, lower-strength freebase products at or below 20 mg/mL may be dispensed by a pharmacist without a prescription under a Schedule 3 pathway, though the majority of pharmacies continue to operate on a prescription-only basis. Higher-strength products and all nicotine salt formulations above 20 mg/mL remain Schedule 4 and require a valid prescription.

Nicotine Absorption: How Each Formulation Enters the Bloodstream

One of the most practically important differences between the two formulations is how quickly nicotine enters your bloodstream. A 2024 randomised crossover study published in Nicotine & Tobacco Research found that nicotine salt formulations delivered higher peak serum nicotine concentrations than freebase nicotine at equivalent concentrations using the same device. For someone in the early stages of quitting, that difference can make a real impact on how effectively a craving is managed.

The reason for this comes down to chemistry. The acid used in nicotine salt formulations makes the nicotine molecule more compatible with the lining of your lungs, allowing it to cross into the bloodstream more readily. A 2022 study in Drug Testing and Analysis also confirmed that nicotine salts reached peak plasma concentration more quickly than freebase nicotine, with absorption speed increasing as the proportion of benzoic acid in the formulation increased.

In practice, this means nicotine salts more closely replicate the rapid nicotine spike you get from a cigarette, which is why they are often the starting point for heavy smokers transitioning off combustibles. As your weaning schedule progresses and cravings become less intense, your prescriber may move you to a lower-concentration or freebase product.

Nicotine Strength and Dependence Risk

Nicotine salt products are available at much higher concentrations than freebase, commonly between 20 mg/mL and 50 mg/mL, compared to the 3–18 mg/mL range typical of freebase liquids. This difference in strength is clinically relevant, because higher concentrations carry a greater risk of sustaining nicotine dependence if the product is used without a structured step-down plan.

This is why your prescriber will set a weaning schedule – a plan that gradually reduces the concentration of nicotine you use over time. The goal is not simply to swap cigarettes for a vape and stay there. The goal is to use the vaping product as a stepping stone toward being entirely nicotine-free. A key part of this is monitoring how much nicotine one is using per day – this is easier to monitor with pre-filled “closed-system” pod devices.

It is worth being honest with yourself and with your prescriber if you notice you are using your device more than intended, or finding it difficult to reduce your dose. This is a recognised sign of nicotine dependence, and your prescription can be reviewed and adjusted. Quit Clinics provides access to TGA Authorised Prescribers who can assess your progress and modify your weaning plan as needed.

Which Form of Nicotine Is Used in Smoking Cessation Programmes?

Both nicotine salts and freebase nicotine can be used as part of a TGA-supervised smoking cessation programme in Australia. The choice between them is not one-size-fits-all – it depends on how much you currently smoke, how strong your cravings are, and what stage of the quitting process you are at.

Generally speaking, nicotine salts are more commonly prescribed to people who are heavy smokers at the start of their cessation attempt, or users transitioning from black market disposable devices, or “dispos”. Freebase nicotine may be introduced later in the weaning process, once the initial intensity of cravings has reduced and a lower-concentration, lower-absorption product is sufficient to manage them.

Your device type also matters. Smaller pod-style devices are generally paired with nicotine salts, while larger sub-ohm devices suit freebase formulations. Your prescriber will take both factors into account when recommending a product available through an authorised Australian pharmacy.

What Is the Safest Form of Nicotine?

Neither nicotine salts nor freebase nicotine can be considered completely safe — and it is important to be clear about that. All forms of nicotine carry some health risk, including effects on the cardiovascular system and the potential for ongoing dependence. There is also a lack of long-term research on inhaled nicotine products specifically, which means the full picture of risks is not yet known.

What the evidence does support is that replacing combustible cigarettes — which expose you to thousands of harmful chemicals produced by burning tobacco — with a prescription nicotine vaping product is likely to reduce your overall exposure to toxicants. This is a harm-reduction position, not a claim that vaping is harmless.

The most clinically sound approach is to use whichever formulation your prescriber recommends, at the lowest concentration that manages your cravings, for the shortest period necessary to achieve full nicotine cessation. If you have questions about which product is right for you, Quit Clinics provides access to TGA Authorised Prescribers who can assess your history and guide your cessation plan.

Frequently Asked Questions

Are nicotine salts stronger than freebase nicotine?

Nicotine salt products are available at higher concentrations and are absorbed more quickly, which means they can feel stronger – particularly to someone who has not used nicotine before. However, what you actually experience depends on your device, how frequently you use it, and your individual tolerance. Your prescriber will recommend a starting concentration based on your smoking history and will adjust it over time as part of your weaning plan.

Which type of e-liquid is better for quitting smoking?

There is no single answer – it depends on your level of nicotine dependence and where you are in the quitting process. If you are a heavy smoker who has recently stopped, nicotine salts are often the more effective starting point because they manage cravings more quickly. If you are further along and your cravings are less severe, freebase nicotine at a lower concentration may be a more appropriate next step. Your prescribing clinician is best placed to make that call.

How long should I use nicotine vaping products as a cessation tool?

Nicotine vaping products are intended as temporary aids, not permanent replacements for cigarettes. Prescriptions are typically written for three to twelve months, with the aim of progressively reducing your nicotine dose until you no longer need it. If your prescription period ends and you are still struggling to reduce your usage, speak with your prescriber – your plan can be reviewed. Remaining on any nicotine product indefinitely without clinical review is not recommended.

Nicotine Salts vs Freebase E-Liquids in Vapes Comparison Table