A 19-year-old man died in Saint-Marie-aux-Chênes, France, in late March 2025 after a scooter collision with a car driven by a man who had consumed nitrous oxide, commonly known as “laughing gas.” The incident, which led to a January 2026 trial in Metz, highlights a growing legal and public safety challenge in France regarding the use of the substance and its connection to road accidents.
While the sale of nitrous oxide to minors is prohibited and its misuse is increasingly linked to serious incidents, French law currently lacks specific provisions to penalize driving under its influence. This legal ambiguity was underscored by Éric de Caumont, a lawyer specializing in traffic law, who stated that “at present, there is absolutely no prohibition” regarding nitrous oxide use, beyond the restriction on sales to those under 18.
However, the situation is not entirely without legal recourse. The creation of the offense of aggravated homicide, and a subsequent circular issued by the Minister of Justice in July 2025, have provided some avenues for prosecution. The circular specifically mentions the misuse of nitrous oxide as an aggravating circumstance in cases of road deaths. If a driver’s nitrous oxide consumption can be proven and directly linked to an accident, it can be considered an aggravating factor, impacting both criminal and civil proceedings.
Despite this, significant obstacles remain. A key challenge is the lack of readily available testing methods to detect nitrous oxide in drivers. According to de Caumont, “There are currently no tests or screenings, and police and gendarmes are not asked to detect nitrous oxide.”
The issue has prompted calls for legislative action. Vincent Ledoux, a member of the National Assembly, questioned the government in February 2026 about the possibility of creating a specific offense for driving under the influence of substances altering faculties, even those not classified as narcotics. Ledoux similarly suggested classifying nitrous oxide as a psychoactive or risky substance within the traffic code and developing detection methods.
The rise in nitrous oxide-related incidents is not limited to single cases. Authorities have observed a concerning increase in accidents involving drivers suspected of using the gas, particularly in regions like Hauts-de-France and Île-de-France. The French National Agency for the Safety of Medicines (ANSM) recorded nearly 1,500 adverse effects linked to nitrous oxide consumption between 2012 and 2021, with a notable proportion connected to driving situations. A march was held in Saint-Omer in November 2025 to commemorate a 19-year-old killed by a driver who had used nitrous oxide.
François Pérain, the General Prosecutor near the Court of Appeal of Metz, described the phenomenon as “an emerging issue that is progressing,” noting the potentially devastating consequences of even brief euphoria induced by the gas. He acknowledged the “legal vacuum” surrounding the issue, but indicated that authorities are exploring available legal tools to address the problem.
The French Road Safety agency has warned that nitrous oxide endangers not only the health of those who consume it, but also renders drivers incapable of safely operating a vehicle, posing a danger to others.
