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.
East Devon food bank readies fundraising push
The Ottery Larder supports 500 people per week
New Dartmoor boss says job is a dream come true
'I am delighted to be here, and I see huge opportunities'
Devon rapist jailed for 10 years
Philip Street told victim it 'was our secret'
75 homes pledged near Buckfastleigh
45 percent to be affordable
Residents return home after WW2 bomb detonated
Emergency services thank Plymouth residents
WW2 bomb found in Plymouth to be detonated today
Thousands evacuated from Southway
