Nitrous oxide: understanding addiction, neurological risks and the new 2026 french law

The misuse of nitrous oxide, often called “laughing gas”, has become a major public health issue in France in just a few years. Originally used in medicine for its anaesthetic properties or in cooking for whipped cream siphons, this gas is now consumed recreationally, especially among young people.

Since February 2026, France has taken a major legislative turn: the sale of nitrous oxide is now forbidden to private individuals and reserved for professionals.

In this article, we look at:

• the mechanisms of nitrous oxide addiction
• the neurological and psychiatric effects
• the serious medical risks
• the reasons for this substance’s popularity
• the new legislative measures in France

What is nitrous oxide?

Nitrous oxide (N2O) is a gas that has long been used in medicine for its analgesic and anaesthetic effects. In cooking, it is used to propel cream in siphons.

However, recreational inhalation produces a very brief feeling of euphoria accompanied by sensory distortions. This effect lasts only a few minutes, which often leads users to repeat the inhalations.

How does nitrous oxide addiction develop?

Nitrous oxide addiction relies on neuropsychological mechanisms similar to those observed with other psychoactive substances.

The reward circuit and dopamine

Each inhalation stimulates the release of dopamine in the brain, especially in the nucleus accumbens. This activation of the reward circuit reinforces the behaviour and encourages repetition of use.

Because the effect is very short-lived, the brain enters a state of constant pursuit of the initial sensation.

Intermittent reinforcement

Nitrous oxide creates a pattern of intermittent reinforcement: sometimes the effect is strong, sometimes less so. This unpredictability strengthens attachment to the product.

This mechanism is similar to that of social networks or gambling: uncertainty keeps the behaviour going.

The effects of nitrous oxide on the brain

Nitrous oxide acts on several neurobiological systems.

NMDA receptors

The gas blocks NMDA receptors, which are involved in memory and learning. This explains the cognitive difficulties observed in some chronic users.

Opioid systems

Nitrous oxide also stimulates the release of endogenous opioids, which are responsible for the feeling of euphoria and the analgesic effect.

GABA system

Finally, it acts on GABA receptors, which are involved in relaxation and reduced anxiety.

The major danger: destruction of vitamin B12

One of the most serious effects of nitrous oxide is the inactivation of vitamin B12.

This vitamin is essential for the proper functioning of the nervous system and for the formation of the myelin sheath that protects nerves.

When nitrous oxide inactivates vitamin B12:

• nerve repair stops
• nerves gradually deteriorate
• neurological disorders appear

Symptoms of nitrous oxide poisoning

The signs can appear immediately or after repeated use.

Immediate risks

• loss of consciousness
• hypoxia (lack of oxygen)
• cold burns
• accidents and injuries

Neurological disorders

The first signs are often:

• tingling in the hands and feet
• loss of sensation
• walking difficulties

In severe cases, paralysis of the lower limbs may occur.

Psychiatric disorders

Some users develop:

• hallucinations
• delusional episodes
• anxiety disorders
• memory and concentration difficulties

Why has use exploded?

Several factors explain the popularity of nitrous oxide:

• easy access and very low cost
• normalisation on social networks
• home delivery
• the mistaken belief that it is harmless

The appearance of large-capacity canisters has also encouraged heavy use.

The new French law of 2026

Faced with the rise in poisonings, France adopted a major law in February 2026.

The main measures are:

• a ban on the sale of nitrous oxide to private individuals
• sales reserved for professionals
• tougher criminal penalties
• action against driving under the influence

This reform aims to limit access to the product and reduce health risks.

Can nitrous oxide addiction be treated?

Care generally rests on two main pillars.

Complete cessation of use

The first step is to stop the product entirely in order to prevent ongoing destruction of vitamin B12.

Medical care

Treatment generally includes:

• vitamin B12 injections
• neurological follow-up
• motor rehabilitation

Addiction support

Psychological support helps to understand the function of the use and to learn other ways of regulating emotions.

Where can people get help?

Several services support people in difficulty:

Local health and addiction services can provide confidential medical and psychological support. The relevant services depend on the country where you live.

Conclusion

Nitrous oxide is not a harmless substance. Behind the image of “laughing gas” lies a product capable of causing serious and sometimes irreversible neurological damage.

The new French legislation of 2026 marks an important turning point in preventing this emerging addiction.

Better information and early support remain essential to protect the populations most exposed.