Sharon Cook, 54, lost 24-year-old daughter Ellen after she became hooked on the party drug.

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Her devastated mum spoke of the moment she was called by medics.

Sharon told The Sun: “I got a phone call saying that she died of a heart attack and a stroke.

“They told me it was because of nitrous oxide.

“I had no idea she was addicted.”

Ellen, a business student from Gerrards Cross, Bucks, became gravely ill in February last year and died in hospital the following day.

Mum-of-two Sharon, who works as a delivery driver, called on the Government to tighten sentences.

She said: “It is illegal now, but it’s too late for Ellen. More needs to be done.

“Nitrous oxide can kill you. It should be a class A drug.

“If you are caught selling it you should be locked up. Don’t mess with it. It’s not worth your life.”

A full inquest into Ellen’s death will be held this month.