Nitrous oxide canisters / cream puff chargers and balloons: steel cylinders contain nitrous oxide / laughing gas which is used for legal high Stock Photo - Alamy
Laughing gas cannisters are 'easily available in corner shops, online or over the phone' - Manchester Evening News
How dangerous is laughing gas? - BBC News
Over 100 discarded laughing gas canisters and 'hippie crack' balloons found in High Wycombe street | Bucks Free Press
Nitrous Oxide canisters, balloons and boxes litter the Thames Path after youths spend the night inhaling the laughing gas Stock Photo - Alamy