Where Does Nicotine Come From? Tobacco vs Synthetic Nicotine

Nicotine and tobacco have been associated with one another for so long that it's easy to assume they're essentially the same thing.

They aren't.

Nicotine is a naturally occurring chemical made by the tobacco plant. Tobacco just happens to be exceptionally good at producing it, which is why tobacco has historically been the commercial source of nearly all of the nicotine used in cigarettes, vape juice and nicotine-replacement products.

Today, though, tobacco isn't the only possible source.

Chemists can now manufacture nicotine without using a tobacco plant at all. This is known as synthetic nicotine or sometimes tobacco-free nicotine, and it has gone from an expensive curiosity to a genuine part of the modern nicotine industry.

So, where does nicotine come from? The short answer is that it can come from one of two places: tobacco plants or a chemical manufacturing process.

What Is Nicotine?

Nicotine is a naturally occurring alkaloid — a type of nitrogen-containing organic compound produced by plants.

Its molecular formula is C₁₀H₁₄N₂.

In people, nicotine interacts primarily with nicotinic acetylcholine receptors in the nervous system. It can produce effects including increased alertness and is strongly dependence-forming.

That addiction is why nicotine keeps many smokers returning to cigarettes.

It is important, however, to separate nicotine addiction from the harms of smoking.

Nicotine is addictive and isn't something non-smokers should start using. However, the NHS explains that nicotine itself isn't what causes the cancer, lung disease and most of the other major illnesses associated with cigarettes. Those harms are overwhelmingly caused by the thousands of chemicals produced when tobacco burns.

You can read the NHS explanation of nicotine and smoking risk for more detail.

Where Does Nicotine Occur Naturally?

The plant most strongly associated with nicotine is, unsurprisingly, tobacco.

The main cultivated tobacco species is Nicotiana tabacum, although other species of the Nicotiana genus also produce nicotine and related alkaloids.

Tobacco is part of the nightshade family, or Solanaceae.

Very small quantities of nicotine have also been measured in edible members of that family, including:

• Tomatoes
• Potatoes
• Aubergines
• Peppers

Those concentrations are tiny compared with tobacco and don't make vegetables a realistic commercial source of nicotine.

So although the technically correct answer is that nicotine exists naturally in several plants, tobacco is the plant that matters commercially.

Where Does the Tobacco Plant Actually Make Nicotine?

Here's one of the more interesting parts of the answer.

You might expect nicotine to be manufactured in tobacco leaves because that's where so much of it eventually ends up.

It isn't.

Tobacco plants produce most of their nicotine in their roots.

Once the plant has made nicotine underground, it transports the compound upwards through its vascular system — mainly through the xylem — into the stems and leaves.

Nicotine then accumulates in leaf cells.

Plant researchers have mapped this process in considerable detail. A 2023 review of tobacco nicotine biosynthesis describes nicotine being produced primarily in the roots, transported to the leaves and stored there.

You can read the research review on nicotine biosynthesis if you'd like the full molecular version.

Why Does Tobacco Produce Nicotine?

Not for us.

From the tobacco plant's point of view, nicotine is essentially a chemical defence system.

Nicotine is toxic to many insects and helps protect the plant from being eaten.

The plant can even increase nicotine production in response to damage. Signals triggered by herbivore attack cause nicotine-production pathways in the roots to become more active, after which more nicotine is transported towards the leaves.

In other words, the chemical that humans eventually learned to smoke, chew and vape evolved primarily because it was useful for discouraging insects from having tobacco for lunch.

Is Nicotine Added to Tobacco?

A cigarette doesn't need added nicotine in order to contain nicotine.

The tobacco leaves already contain it naturally.

Different varieties of tobacco can contain different amounts, and growing methods, plant genetics and leaf position can all influence nicotine concentration.

Tobacco manufacturers can also alter how nicotine is delivered and experienced through product formulation and processing, but the nicotine itself originates naturally in the tobacco plant.

Where Does the Nicotine in Vape Juice Come From?

Historically, the nicotine used in e-liquid has overwhelmingly been tobacco-derived nicotine.

The basic process is conceptually straightforward:

1. Tobacco plant material provides the starting source.
2. Nicotine and other soluble compounds are extracted from the plant material.
3. The nicotine is separated from unwanted plant compounds.
4. Repeated purification produces highly refined nicotine suitable for further formulation.

By the time purified nicotine reaches an e-liquid manufacturer, it doesn't look or taste like a tobacco leaf. Highly purified nicotine is a clear-to-pale liquid, although it can darken through oxidation with age and exposure to air or light.

The manufacturer then dilutes the nicotine to the required strength using the other ingredients in Vape Juice.

Does Tobacco-Derived Nicotine Make Vape Juice a Tobacco Product?

Not in the ordinary sense of containing tobacco leaf.

A fruit-flavoured e-liquid made with tobacco-derived nicotine doesn't contain shredded tobacco simply because the nicotine originally came from a tobacco plant.

The nicotine has been extracted and highly purified before being added to the finished formulation.

It's somewhat like using purified caffeine without having coffee beans floating around in the drink.

What Is Synthetic Nicotine?

Synthetic nicotine is nicotine manufactured through chemical synthesis rather than extracted from a tobacco plant.

The finished molecule can be chemically the same nicotine molecule found in tobacco.

You'll also see synthetic nicotine described as:

• Tobacco-free nicotine
• TFN
• Non-tobacco-derived nicotine
• Lab-made nicotine

The important distinction is the source.

Tobacco-derived nicotine begins with a plant and is extracted and purified.

Synthetic nicotine begins with other chemical raw materials and is assembled through chemical reactions.

Why Has Synthetic Nicotine Become More Common?

Synthetic nicotine has existed for a long time. What changed was whether producing it at commercial scale made economic sense.

Extracting nicotine from tobacco was historically much cheaper, which gave manufacturers little incentive to create the molecule from scratch.

Improved manufacturing processes and growing demand have made synthetic nicotine increasingly practical.

There are several reasons why manufacturers may find it attractive.

It Doesn't Require Tobacco

This is the obvious advantage.

A synthetic-nicotine manufacturer doesn't need tobacco crops as its starting material.

That allows manufacturers to describe the nicotine itself as non-tobacco-derived.

It Can Be Extremely Pure

One attraction of chemical synthesis is the ability to produce highly purified nicotine without the trace tobacco-derived compounds that can accompany plant extraction.

That doesn't mean synthetic nicotine is automatically safer, though. Purity depends on the manufacturing and purification process regardless of where the nicotine started.

It Can Have a Very Neutral Flavour

Highly pure nicotine has relatively little flavour of its own.

Removing plant-derived impurities can be attractive to e-liquid manufacturers trying to create very clean or delicate flavour profiles.

Regulation Helped Drive Early Adoption Overseas

Synthetic nicotine became especially prominent in the United States when some manufacturers attempted to use its non-tobacco origin to avoid regulations that initially applied specifically to tobacco-derived nicotine.

US law was subsequently changed to close that loophole.

The UK is taking an equally source-neutral direction: current government guidance explicitly says that nicotine-product rules include synthetic nicotine made in a laboratory as well as nicotine extracted from plants.

Has Synthetic Nicotine Reached the UK?

Yes.

Synthetic nicotine is now part of the UK nicotine market, particularly in categories such as nicotine pouches, and UK regulators expressly recognise it.

The government's current guidance no longer leaves any ambiguity about whether "nicotine" means only nicotine obtained from tobacco. It states that all types are included, specifically mentioning synthetic nicotine manufactured in a laboratory.

That said, synthetic nicotine isn't necessarily what you're getting whenever you buy an ordinary bottle of UK e-liquid.

Tobacco-derived nicotine remains well established, and many manufacturers don't make the source of their nicotine a major part of the product's marketing.

If a manufacturer specifically uses synthetic nicotine, you'll often see terms such as synthetic nicotine or TFN used because the tobacco-free origin is one of the product's distinguishing features.

Is Synthetic Nicotine Exactly the Same as Natural Nicotine?

This is where things become slightly more complicated.

Nicotine is a chiral molecule. That means it can exist in two mirror-image forms, or enantiomers:

• S-nicotine
• R-nicotine

The nicotine produced by tobacco plants is overwhelmingly the S form.

Some chemical synthesis methods naturally produce a roughly equal mixture of S- and R-nicotine. This is called a racemic mixture.

That matters because the two forms don't interact with the body identically. S-nicotine has the stronger activity at the receptors normally associated with nicotine's effects.

Modern manufacturers can also produce highly purified synthetic S-nicotine, so the phrase "synthetic nicotine" does not automatically mean a 50/50 mixture.

In other words:

• Plant-derived nicotine is overwhelmingly S-nicotine.
• Some synthetic nicotine contains both S- and R-nicotine.
• Synthetic nicotine can also be manufactured specifically as S-nicotine.

For the average vaper, this chemistry mostly matters because two products labelled with the same nicotine concentration don't necessarily have identical formulations simply because both use synthetic nicotine.

Is Synthetic Nicotine Safer Than Tobacco-Derived Nicotine?

There's no good reason to assume that nicotine becomes harmless simply because it was made in a laboratory.

If you're comparing highly purified S-nicotine from the two sources, you're dealing with the same nicotine molecule.

Synthetic production may offer advantages in controlling certain tobacco-derived impurities, but the important questions are still:

• How pure is the nicotine?
• Which nicotine enantiomer or mixture is present?
• How accurately is the concentration controlled?
• What else is in the finished product?
• Has the product been manufactured and regulated appropriately?

“Synthetic” doesn't automatically mean dangerous, and “natural” doesn't automatically mean safer. Chemistry is annoyingly uncooperative with marketing departments that would prefer things to be that simple.

Is Synthetic Nicotine the Same as Nic Salt?

No. These terms describe two completely different things.

Synthetic vs tobacco-derived tells you where the nicotine came from.

Freebase vs nicotine salt tells you which chemical form the nicotine takes in the e-liquid.

You can therefore have:

• Tobacco-derived freebase nicotine
• Tobacco-derived nicotine salts
• Synthetic freebase nicotine
• Synthetic nicotine salts

Nic salt e-liquid is made by combining nicotine with an acid to create a salt form. That can produce a smoother-feeling inhale at the higher nicotine strengths commonly used in compact pod systems.

If you'd like to explore that format, Simply ELiquid's nic salts range includes a wide selection of flavours and strengths.

What About Nicotine Pouches?

Nicotine pouches are another reason synthetic nicotine has become more visible.

Unlike traditional snus, nicotine pouches don't contain tobacco leaf. Instead, the pouch usually contains plant-based fibres, flavourings and nicotine.

Depending on the manufacturer, that nicotine may be tobacco-derived or synthetic.

Again, this is why tobacco-free pouch and synthetic nicotine shouldn't automatically be treated as synonyms.

Where Does the Nicotine in Patches and Gum Come From?

Nicotine-replacement products such as patches, gum, lozenges and sprays use purified pharmaceutical nicotine.

The nicotine molecule can theoretically be obtained through tobacco extraction or chemical synthesis. What matters for a licensed medicine is the identity, quality, purity and controlled dose of the active ingredient rather than whether a tobacco plant originally produced it.

Can Nicotine Be Made from Tomatoes or Potatoes?

You could perhaps imagine extracting nicotine from tonnes of tomatoes if you had unlimited money, enormous processing equipment and a personal grudge against efficiency.

In practical terms, no.

Although researchers have measured trace quantities of nicotine in some edible nightshade plants, the concentrations are far too small to compete sensibly with tobacco as a commercial source.

Tobacco evolved specifically to produce and accumulate substantial quantities of nicotine as a defence chemical. Tomatoes did not.

Is Nicotine Naturally Present in Cigarettes?

Yes.

A cigarette contains nicotine primarily because tobacco naturally contains nicotine.

Lighting the cigarette doesn't create the nicotine. Instead, heat releases nicotine from the tobacco while combustion simultaneously produces the smoke containing the thousands of other chemicals responsible for most of smoking's serious health effects.

Does Vape Juice Always Contain Nicotine?

No.

E-liquid can be sold completely nicotine-free.

Shortfill e-liquid, for example, is normally supplied at 0mg so that a user can either vape it without nicotine or add nicotine separately.

Nicotine-containing 10ml vape juice is available in many different strengths, allowing smokers who switch to vaping to select a level sufficient to control cravings and then potentially reduce it later if they wish.

Where Will Nicotine Come From in the Future?

Tobacco isn't going to disappear as a nicotine source overnight. Extracting and purifying nicotine from an established agricultural crop is efficient, familiar and supported by an enormous global supply chain.

Synthetic nicotine does remove the agricultural step, though, and manufacturing technology continues to improve.

That gives synthetic nicotine several potential long-term attractions:

• Less dependence on tobacco crops
• Very high purity
• Greater control over the final nicotine composition
• No tobacco-derived starting material
• A potentially more consistent industrial supply

Whether those benefits eventually make synthetic nicotine the dominant source will depend largely on manufacturing cost, regulation and what nicotine-product companies actually choose to use.

What is already clear is that the old answer — “nicotine comes from tobacco” — is no longer complete.

Frequently Asked Questions

Where does nicotine come from?

Nicotine occurs naturally in tobacco plants, which have historically supplied almost all commercial nicotine. Tobacco makes nicotine mainly in its roots and transports it into the leaves. Nicotine can now also be manufactured synthetically without tobacco.

Does nicotine naturally occur in tobacco?

Yes. Tobacco naturally produces nicotine as part of its chemical defence against insects. Cigarette manufacturers don't need to add nicotine to tobacco for it to be present.

Where does nicotine in vape juice come from?

Traditionally, e-liquid nicotine has been extracted and highly purified from tobacco plants. Synthetic nicotine made without tobacco is now another available source.

Is nicotine made in tobacco leaves?

Most nicotine biosynthesis actually occurs in the roots. The plant then transports nicotine upwards through the xylem, and much of it accumulates in the leaves.

Why do tobacco plants contain nicotine?

Nicotine acts as a chemical defence against herbivores, particularly insects. Tobacco plants can increase nicotine production in response to damage.

Is nicotine found in tomatoes?

Trace quantities of nicotine have been measured in tomatoes and several other edible nightshade plants, including potatoes and aubergines. The quantities are tiny compared with tobacco.

What is synthetic nicotine?

Synthetic nicotine is the nicotine molecule manufactured from non-tobacco chemical starting materials rather than extracted from a tobacco plant. It may also be marketed as tobacco-free nicotine or TFN.

Is synthetic nicotine available in the UK?

Yes. Synthetic nicotine has entered the UK nicotine market, and current UK government guidance specifically recognises synthetic nicotine produced in laboratories as a form of nicotine covered by nicotine-product rules.

Is synthetic nicotine legal in the UK?

Synthetic nicotine isn't exempt from regulation simply because it doesn't come from tobacco. UK rules governing vaping and nicotine products are increasingly written to cover nicotine regardless of whether its source is a plant or a laboratory.

Is synthetic nicotine safer?

There isn't enough reason to treat synthetic nicotine as inherently safer simply because of its source. Highly purified synthetic S-nicotine and highly purified tobacco-derived S-nicotine are chemically the same nicotine molecule. Manufacturing quality and the finished product remain important.

What is S-nicotine?

S-nicotine is one of nicotine's two mirror-image molecular forms and is the form overwhelmingly produced by tobacco plants. It is also the form primarily responsible for nicotine's familiar pharmacological effects.

What is R-nicotine?

R-nicotine is the mirror-image form of S-nicotine. Some synthetic manufacturing methods produce both forms together. R-nicotine has different and generally weaker activity at several of the receptors associated with nicotine's effects.

Is synthetic nicotine the same as nic salts?

No. Synthetic describes the nicotine's source, while nic salt describes its chemical form. Both tobacco-derived and synthetic nicotine can be formulated into freebase e-liquid or nicotine salt e-liquid.

Does tobacco-free nicotine always mean synthetic nicotine?

Not necessarily. Marketing terminology can be ambiguous. A finished product can be free from tobacco leaf while containing nicotine originally purified from tobacco. If the nicotine itself is synthetic, look for an explicit claim such as “synthetic nicotine” or “non-tobacco-derived nicotine.”

Is nicotine what makes cigarettes so harmful?

Nicotine is highly addictive, but it isn't responsible for most of the serious diseases caused by smoking. The major harms come from the toxic chemicals generated when tobacco burns. This is why nicotine can also be used in regulated stop-smoking products such as patches and gum.

The Bottom Line

So, where does nicotine come from?

For most of human history, the answer was simple: plants — and overwhelmingly tobacco.

The tobacco plant manufactures nicotine mainly in its roots as a defence against insects. It then sends the nicotine upwards to the leaves, where it accumulates. Commercial producers can extract that nicotine and purify it until very little remains of the plant it came from apart from the nicotine molecule itself.

That's still an important source of the nicotine used in vape juice today.

It's no longer the only one.

Synthetic nicotine allows manufacturers to build the same molecule using non-tobacco raw materials. The technology has improved enough that synthetic nicotine is now a genuine commercial product and has reached the UK market, particularly in newer tobacco-free nicotine categories.

And that's probably the most interesting change since this article was originally written: nicotine and tobacco are finally becoming two genuinely separable things.