Musical festival bosses are being urged to ban 'hippy crack' from their events this summer because it can cause death.
The laughing gas, which is sold in balloons for around £2 per dose, is inhaled to make people feel euphoric and relaxed. But drug experts warn it can cause death on first time use.
Norman Baker, a Liberal Democrat MP, wrote in a letter to festival organisers: "Nitrous oxide can slow down both brain and body response and there is even a risk of death from a lack of oxygen especially if the substance is consumed in a small space or a substantial amount is rapidly used."
He added: "If you have not already done so, I also encourage you to consider a ban on the sale of this substance and where possible take measures to prevent it from being used within the festival site."