Cream chargers which contained nitrous oxide (laughing gas) and a used balloon are indications of illegal drug use in this car park. Cambridge, UK Stock Photo - Alamy
Exposed: The 'hippy crack' craze that is putting Coventry youngsters in danger - CoventryLive
Nitrous oxide no laughing matter for Cambodian government
Laughing gas sales balloon on Dutch party scene - BBC News
The Dangerous Effects Inhaling Laughing Gas Balloons Has On Your Body
Nitrous oxide balloons hi-res stock photography and images - Alamy
Laughing gas balloon hi-res stock photography and images - Alamy
LCD Soundsystem concerts draw laughing gas sellers
What do experts think of the move to make laughing gas illegal?
How dangerous is laughing gas? The history of the drug and its risks, explained | The Independent | The Independent
D.A.R.E. To Resist Drugs and Violence Latex Balloons - 3 Count Multi-color Pack | eBay
Sheriffs: Nitrous oxide, or whip-its, becoming popular in Los Angeles - CBS News