When Britain banned smoking in prison, money had to be reinvented

For decades, if you wanted to know the price of something in a British prison, you didn't ask in pounds. You asked in ounces.

Rolling tobacco, known inside as burn, was the currency of the estate. Haircuts, cell cleans, borrowed trainers, a debt repaid: all of it was priced in burn. Tinned tuna and bars of chocolate circulated as small change. Cash itself is banned in prison, so the economy simply picked something else and got on with it.

Then, between 2016 and 2018, the government switched the currency off.

What happened when the money was banned

Prisons in Wales went smoke-free first, in 2016. England followed in phases through 2017, and by 2018 every closed prison in England and Wales had banned tobacco entirely. Scotland's prisons followed in November 2018.

The public health case was straightforward. Around 80 per cent of prisoners smoked, roughly four times the rate outside, and staff were breathing it all day.

The ban, though, did something no Chancellor has ever done to the pound. It demonetised the entire economy overnight. Every debt, every price, every stash of savings held in burn became worthless by decree.

The transition was rough, and HMP Winchester saw serious disturbances in the months after its ban. In the background, thousands of people in 100-plus institutions faced the same question at the same time: if tobacco isn't money any more, what is?

The £1.33 banknote

Nobody held a vote. No committee published a report. The answer emerged on the wings within months, and it looked like this: a small sealed capsule of vape liquid.

When the ban arrived, the prison service put a rechargeable vape on the canteen list. The official 2017 factsheet from HM Prison and Probation Service reads like a currency specification. The device cost £6.99. Capsules came sealed in packs of three for £3.99, which works out at £1.33 each. One capsule lasts one to two days.

Look at that through an economist's eyes and you can see why capsules became the new burn.

They're scarce: supply is rationed through the canteen, so nobody can flood the market. They're divisible enough: £1.33 is a usable unit for small trades. They're durable: a sealed capsule doesn't rot. They're portable and easy to hide. They're verifiable: a factory-sealed capsule is hard to fake. Crucially, they're wanted: in a population of ex-smokers, demand is close to universal.

Tinned fish and protein powder circulated too, as tobacco's old small change stepped up a rank, but the capsule took the throne, for the same reason gold once beat seashells. It scored highest on the properties that make something work as money.

America ran the same experiment, with fish

Britain wasn't first. The United States banned cigarettes in all federal prisons in 2004, and American prisoners solved the same problem with a stranger answer: sealed pouches of mackerel.

The mack, as it became known, was worth about a dollar at the commissary, and almost nobody actually wanted to eat one. That was the point. It was a stable token of value precisely because it wasn't being consumed. Supply was predictable too, since inmates could only buy a capped number per week.

Two prison systems, two continents, one result. Ban the money and people don't stop using money. They re-derive it from first principles, usually within months.

What this tells you about the pound in your pocket

Here's the part worth sitting with. Nobody teaches prisoners monetary theory. Yet twice in twenty years, closed populations under total institutional control have independently rediscovered what money actually is: not a thing governments create, but a good that people converge on because it's the most saleable thing available.

Economists call the properties involved scarcity, durability, divisibility, portability and verifiability. Prisoners just call it what everyone will accept.

The pound works the same way, with one difference. Its scarcity is a policy, not a property. The Bank of England can and does change how many pounds exist, which is why the purchasing power of £10,000 doesn't sit still over a decade. You can see exactly what that has cost savers over any period you like using our purchasing power of the pound tool.

There's a name for what the prisoners did, and an economist who documented it from the inside eighty years ago.

The economist who saw it coming

In 1945, a British economist named R.A. Radford came home from a German prisoner of war camp and wrote up what he'd witnessed. His paper, The Economic Organisation of a P.O.W. Camp, is now a classic, taught to economics students to this day.

In the camps, cigarettes became money within weeks. Prices for jam, razor blades, chocolate and shirts were quoted in cigarettes, and those prices moved like real prices. When Red Cross parcels arrived and the cigarette supply jumped, prices rose. When deliveries were delayed and cigarettes grew scarce, the camp suffered genuine deflation, with prices falling across the board as the money tightened.

Radford even watched Gresham's law play out, the old observation that bad money drives out good. Prisoners rolled thin, hand-made cigarettes to spend and kept the machine-made ones back, exactly as people once shaved silver coins and passed on the clipped ones.

Nobody in the camp had voted on any of this either. A POW camp in 1945, US federal prisons in 2004, the British estate in 2018: three closed economies, three bans on cash or currency, and three times money rebuilt itself from whatever scored best on the same short checklist.

That checklist, incidentally, is the one Bitcoin was designed against from scratch, a money built for scarcity, durability, divisibility, portability and verifiability on purpose rather than by canteen accident. How that works is a story of its own, and as ever this is education rather than advice; if you're curious, our WTF is Bitcoin guide is the plain-English place to start.

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FAQ

What did UK prisoners use as money before the smoking ban? Rolling tobacco, known as burn. Most goods and services were priced in ounces of it, with tinned tuna and chocolate acting as small change. Cash is prohibited in UK prisons.

When were UK prisons made smoke-free? Welsh prisons went smoke-free in 2016, English prisons in phases through 2017, with all closed prisons in England and Wales smoke-free by 2018. Scottish prisons followed in November 2018.

What replaced tobacco as prison currency? Vape capsules sold through the prison canteen became the main medium of exchange, alongside tinned goods and protein powder. The official canteen price was £3.99 for a pack of three capsules.

Why do prisons keep inventing their own money? Because money is a tool people need, not a thing only governments can make. When cash is banned, the most saleable available good, one that is scarce, durable, divisible and widely wanted, tends to become money on its own.