How Does Snus Work?

Snus works by resting a small, moist pouch between your upper lip and gum, where saliva draws out the nicotine and the thin lining of your mouth passes it into the blood. Nothing is burned, chewed or inhaled, and the effect builds gradually for as long as the pouch stays in place. 18+ only. If you have ever dropped a sachet of manzanilla into a cup of hot water, you already know the principle, because the contents stay inside the bag while what you want slowly seeps out.

In my opinion, the interesting part begins exactly where that short answer ends, so this page follows a pouch from the moment it goes in to the hours after it comes out. Along the way, you will see why the pouch is moist and alkaline, why a friend in Madrid might get something different from the same can, and how to turn the mg/g on a label into mg per pouch. It applies to the snus we stock, it should make the figures clearer when you buy snus, and it sits within our Snus Guide beside pages on history and ingredients.

Does The Same Mechanism Apply To Tobacco Free Pouches?

Yes, the route is the same, because whether a pouch holds tobacco or plant fibre, the nicotine leaves it in saliva and crosses the lining of your mouth. Traditional snus is a Swedish product made from moist ground tobacco, and it replaced nasal snuff in Sweden in the early 1800s, which is why the habit still feels so Scandinavian (the full story sits in where did snus come from). Tobacco free nicotine pouches contain no tobacco leaf at all, and their bulk is mostly plant fibre, which gives the pouch its shape and its soft fit under the lip.

The two sit in the same place and work by the same route, so the names often get used interchangeably. The fillings differ, though, so I would treat them as close relatives rather than twins, and snus vs nicotine pouches sets out where they part ways. The recipes themselves are covered in what is in snus? ingredients explained. Whenever I say pouch on this page, the mechanism holds for both, and I will point out the places where the tobacco recipe changes the picture.

Where Does The Pouch Go, And Why The Upper Lip?

The pouch goes under your upper lip, between the lip and the gum. Snus is used either as a loose pinch or as a portion in a small sachet, and both are placed under the upper lip. Loose snus is a moist powder shaped into a small cylinder or sphere by hand or with a little device, while portions come ready made in mini, normal and maxi sizes, which our guide to what types of snus are there explores in full.

Why the upper lip? The inside of the lip and cheek is covered by what researchers call the buccal mucosa, a thin lining that is unkeratinised, meaning it lacks the tougher outer layer that covers skin. In a laboratory study using pig cheek tissue, nicotine passed mainly through that unkeratinised lining, which helps explain why a pouch tucked against it can work so quietly.

Do you need to spit? No, spitting is not needed with snus, and when you are finished, the used pouch simply comes out with a fingertip and goes in a bin. On a Madrid metro ride or at a desk in Barcelona, that makes it one of the quieter routines you could choose.

How Does Nicotine Get From The Pouch Into Your Blood?

Nicotine travels in two steps: first it dissolves out of the filling into your saliva, then it crosses the lining of your mouth into the small blood vessels beneath it. Those are separate events, and the distinction is worth holding on to. A pouch can contain nicotine that never leaves the filling, and nicotine can leave the filling yet be swallowed with saliva rather than absorbed through the lip. It could be argued that the figure on the can describes what the pouch holds, while everything after that depends on the conditions in your own mouth.

Once absorbed, nicotine circulates in the blood and is later broken down by the liver. That last stage is covered further down the page, but first the route into the blood deserves the closer look that follows.

Why Is Snus Moist, And Why Does pH Matter So Much?

The pH of snus matters because an alkalising agent shifts the balance towards the form of nicotine that crosses the mouth lining easily. Traditional snus is made by blending ground tobacco with water and salt, plus an alkalising ingredient, typically sodium carbonate or bicarbonate, then heating the mix under pressure, with flavourings usually added afterwards. Most snus is steam pasteurised rather than fermented, a method introduced in Sweden in the 1820s. Moisture is a separate matter, since moist snus ends up more than half water. Each stage is set out in how is snus made.

The alkalising agent earns its place in the recipe. Nicotine can exist in a charged form or in an uncharged form called free base, and the balance between the two depends on pH. With a pKa of 8.10, nicotine is mostly charged at around pH 7.4, while above pH 8 the free base takes over. Free base nicotine is more lipophilic, meaning it mixes more readily with fats, so it passes through the fatty membranes of the mouth lining far more easily than the charged form does.

The pig cheek study shows how sensitive this balance is. Nicotine permeated the tissue at about 52.7 millionths of a centimetre per second at pH 8.06, but only about 22.7 at pH 7.79, so a drop of less than a third of a pH unit cut the rate by more than half. As such, how much nicotine is absorbed depends heavily on both the nicotine content and the final pH of the product. In my opinion, that is the most useful idea on this page, because it explains why the figure on the can is a starting point rather than the whole story.

Why Does Snus Build Slowly Rather Than All At Once?

Snus builds gradually because nicotine has to dissolve into saliva and then cross the mouth lining. Format and routine play their part too, since a pouch rests in place under the lip and keeps releasing without you doing anything, whereas something you have to hold or handle asks for your attention each time.

Nicotine gum and lozenges rely on the mouth lining too, and with those formats absorption depends on salivary pH, which food and drink can change. The difference with snus is purely one of format, since the pouch sits still in one place and keeps releasing steadily.

How Long Do You Keep A Snus Pouch In?

Most sessions last from half an hour to two hours, and the directions printed on your own can are the sensible guide inside that range. That is a wide span, and perhaps it should be, because strength, flavour, pouch format and your own comfort all shape when a pouch feels finished. The flavour is usually boldest in the first few minutes and gradually softens, much as a piece of chewing gum mellows.

When is a pouch spent? Usually, it is when the flavour has faded and the pouch has given up most of what it had to offer, at which point it comes out and goes in the bin. Because release is gradual, there is no sudden stop to the nicotine curve, which tapers gently instead. So, if you are planning a long afternoon, it helps to think of one pouch as one session rather than the whole day, with the can telling you how that particular product is meant to be used.

What Happens To The Nicotine Once The Pouch Is Out?

Once the pouch is out, the nicotine already in your blood is broken down by the liver, and the effect fades gradually rather than switching off. The main enzyme doing that work is CYP2A6, and the elimination half life of nicotine is about two hours, which means roughly half of it is cleared in that time. That slow decline mirrors the slow build at the start, which is part of the reason a pouch session has such an even shape from beginning to end.

Cotinine is the main metabolite of nicotine, with a half life of roughly 16 to 20 hours. For you, the practical point is simply that the effect of one pouch tails off over the following hours.

Why Does The Same Pouch Work Differently For Two People?

The same pouch can work differently for two people because saliva, mouth pH, time in place and the amount swallowed all vary from one person to the next. Your saliva sets the conditions the nicotine dissolves into. For gum and lozenges, absorption depends on salivary pH, which food and drink can change, and that is one reason mouth conditions matter for any format that works through the lining.

Time plays its part as well, since a pouch kept in for longer has more opportunity to release, and swallowing matters because nicotine carried away in saliva never meets the lip lining at all. Put those together with the pH sensitivity described above, and it becomes clear why two people sharing a can can describe it in different ways. It could be argued that this is the best reason to treat a strength figure as a map rather than a promise, which brings us neatly to the numbers printed on the can.

How Do You Work Out mg Per Pouch From The Can?

To learn what a single pouch holds, take the concentration printed on the label and scale it to how many grams one pouch weighs. The mg/g tells you how much nicotine sits in each gram of filling, but pouches come in different weights, so concentration alone cannot tell you the content of one pouch. Take Pablo Exclusive, made by NGP Empire: the label shows 50mg/g and each pouch weighs 0.60g, so multiplying the two reaches 30mg in every pouch. If you browse Pablo snus, that sum is worth doing for any can that shows mg/g first.

Because weight counts as much as concentration, a heavier pouch with a gentler mg/g figure can end up holding more than a lighter pouch with a stronger one. Our bands use the per pouch figure, starting with Light at 1 to 8mg, then Medium at 8 to 16mg, Strong at 16 to 25mg and Extreme above 25mg, which places that 30mg Pablo pouch in Extreme. Keep the pH point in mind too, since a label gives you nicotine content rather than uptake. Choosing a level is its own question, answered in what snus strength should I use.

Which Small Habits Help A Pouch Work As It Should?

Keep the pouch still against your upper lip, swap sides between pouches and read the can before you start, and the mechanism will largely take care of itself. There is no need to move a pouch around, because release depends on moisture and steady contact with the lining rather than on any effort from you. Letting it settle in one spot keeps that contact even, which is exactly what the buccal mucosa needs in order to do its quiet work.

So, if you are new to this, my suggestion is a simple routine that travels well, from a café in Málaga to an office in Zaragoza, and we deliver to Spain whenever you would like a can of your own. Check whether the label shows mg/g or mg per pouch, and do the multiplication if it shows mg/g. Then place the pouch high under your upper lip, leave it there until the flavour has faded, and take it out and bin it before you reach for the next one.

Sources

• Wikipedia: Snus
• Wikipedia: Nicotine
• Wikipedia: Nicotine pouch
• PubMed Central: peer reviewed article on buccal nicotine permeation in vitro