Why is nitrous bad for you

Content on WhatAnswers is provided "as is" for informational purposes. While we strive for accuracy, we make no guarantees. Content is AI-assisted and should not be used as professional advice.

Last updated: April 8, 2026

Quick Answer: Nitrous oxide (laughing gas) is harmful primarily due to its potential to cause vitamin B12 deficiency, which can lead to severe neurological damage like peripheral neuropathy and spinal cord degeneration. In the UK, nitrous oxide-related hospital admissions increased by 300% between 2019 and 2022, with over 1,000 cases reported in 2022 alone. The gas can also cause acute oxygen deprivation (hypoxia), leading to brain damage or death, particularly when used in enclosed spaces or with high-frequency consumption.

Key Facts

Nitrous oxide inactivates vitamin B12, causing deficiency that can result in irreversible nerve damage within weeks of regular use.
In 2022, the UK recorded 1,089 hospital admissions specifically linked to nitrous oxide misuse, a sharp rise from previous years.
Prolonged use can lead to myeloneuropathy, a condition damaging the spinal cord and peripheral nerves, often requiring months of B12 treatment.
Nitrous oxide displaces oxygen in the lungs; inhaling it from balloons or canisters can reduce oxygen levels to dangerous lows, risking hypoxia.
The gas is classified as a psychoactive substance under the UK's Psychoactive Substances Act 2016, making its recreational sale and possession illegal.

Overview

Nitrous oxide, commonly known as laughing gas, is a colorless, sweet-smelling gas first synthesized in 1772 by English chemist Joseph Priestley. Initially used as an anesthetic in dentistry and surgery since the 1840s, it gained recreational popularity in the late 20th century due to its euphoric and dissociative effects. Today, it is often misused from small metal canisters (whippets) or balloons, particularly among young adults at festivals and parties. In the UK, its recreational use surged in the 2010s, leading to increased public health concerns. The gas is legally available for medical and culinary purposes (e.g., in whipped cream dispensers), but its non-medical use poses significant risks, with global health agencies like the WHO highlighting its neurotoxic potential. By 2023, countries like the Netherlands and the UK implemented stricter controls to curb misuse.

How It Works

Nitrous oxide acts as a central nervous system depressant by modulating NMDA receptors in the brain, inducing feelings of euphoria, relaxation, and altered perception. When inhaled, it rapidly enters the bloodstream through the lungs, reaching the brain within seconds. The primary mechanism of harm involves the oxidation of cobalt in vitamin B12 (cobalamin), rendering it inactive. This disrupts the synthesis of myelin, the protective sheath around nerves, leading to demyelination and neurological symptoms like numbness, tingling, and weakness. Additionally, nitrous oxide can displace oxygen in the alveoli, causing hypoxia if inhaled in large quantities or without adequate ventilation. Chronic use exacerbates B12 depletion, with studies showing that regular consumption over weeks can lower B12 levels by up to 50%, triggering conditions like subacute combined degeneration of the spinal cord.

Why It Matters

The misuse of nitrous oxide has real-world impacts, including a rise in emergency hospitalizations and long-term disabilities, particularly among adolescents and young adults. In the UK, NHS data from 2022-2023 shows that nitrous oxide-related incidents strain healthcare resources, with treatment costs for neurological damage averaging £5,000 per patient. Beyond health, environmental concerns arise from discarded canisters, which contribute to litter and metal waste. Public awareness campaigns, such as those by Public Health England, emphasize the risks to deter use, while law enforcement efforts target illegal distribution. Understanding these dangers is crucial for policymakers, educators, and healthcare providers to develop effective prevention strategies and support affected individuals.