Police in Exeter are warning of the dangers of nitrous oxide - or 'laughing gas'.
Lately they've been finding used canisters in local parks - most recently in Heavitree, but also in St Thomas.
When inhaled the gas can cause oxygen starvation to the brain - and the risk is increased if it's taken with alcohol.
Plymouth murder suspect named
Manhunt underway to find Paul Antony Butler
Murder investigation launched in Plymouth
The suspect is still at large
Is this the end for Exeter's boat that wouldn't die?
The Marie Claire was once a record-breaker
Woman jailed for shop thefts in South Devon
37-year-old Lucy Hanks stole 34 bottles of wine
Teenage girl missing from Exeter
Have you seen 14-year-old India Ford?
Derriford's new A&E upgrades welcomed by MPs
Construction is expected to start in the summer
