The Home Office recently urged festivals to crack down on laughing gas.

The oxide of nitrogen so formed is called nitrous oxide or laughing gas.

Most of us probably thought that nitrogen oxide was laughing gas.

At certain moments, watching it felt like inhaling laughing gas mixed with helium.

Or I shouldn't wonder if it was something like nitrous-oxide-youknow, laughing gas.

Now, intuition and conjecture... that's like filling the bouncy castle with laughing gas.

After food I went up to the Stone Circle and had some laughing gas.

Can't trust myself when they turn on that laughing gas.

The solid plastic-type propellant is ignited by nitrous oxide, commonly known as laughing gas.

See, nitrous oxide, or laughing gas, is the big thing.

It is thought the 18-year-old had taken nitrous oxide, more commonly known as laughing gas.

It's called " laughing gas" for the euphoric state it imparts when it's inhaled.

The aroma was like laughing gas in the dentist's chair-itmade everything else go away.

At the beginning of the century Sir Humphrey discovered laughing gas, as it was then called.

Mark Sanders reports from East London, where many street vendors have had their laughing gas seized.

Also known as laughing gas, the substance is a vital element of many medical procedures and operations.