Firefighters have been visiting homes in Carlisle to spread awareness of the dangers associated with carbon monoxide.
They say that although people are becoming more aware of the dangers, not everyone is buying the detectors.
Carbon monoxide detectors can be bought from most major supermarkets and online, and start from around £10.
More top news
SNP's Blackford calls on PM to tell bank boss to act on closures while Holyrood colleague accepts "commercial realities".
The huge class A substance haul is said to have been located at an address in Carlisle's Derwent Street on 18 November.
Comedian Peter Kay has cancelled his upcoming tour, citing "unforeseen family circumstances".