A mother-of-six collapsed in her home and later died in hospital while pregnant with her seventh child, an inquest has heard.
Lindsay Ann Hughes became ill in her kitchen and was taken to an intensive treatment unit at hospital, where she died 13 days later. She was found to have 'abnormally high' levels of the cocaine in her system.
The 34-year-old was 15 weeks pregnant with a son at the time of her death on March 27. She had bronchopneumonia, which caused her to collapse and led to respiratory failure.
At Miss Hughes' inquest held in Caernarfon, coroner Dewi Pritchard said an "abnormally high level eight times over the level for driving" of cocaine was found in her system, which would have contributed to her death.
A post-mortem examination revealed the former Ysgol Gyfun Llangefni pupil had damage to her heart known as cardiac fibrosis, which can be caused by chronic cocaine use, North Wales Live reports.
Benzodiazepine, a drug used for a variety of medical conditions such as anxiety and seizures, as well as for alcohol withdrawal, was also found in her system.
The baby Miss Hughes was carrying at the time of her death was said to be a "perfectly healthy male foetus".
Mr Pritchard said: "I am seeing far too many cocaine deaths as the use of cocaine in this part of the world is very common. Cocaine damages the heart by killing off patches of heart tissue and causes a tightening of the vessels. Even low levels of cocaine can cause catastrophic results and repeat use causes more and more damage. The public think cocaine doesn't do any long-term harm but it does. Cocaine use can and does cause long term issues."
He said Miss Hughes died as a result of respiratory failure due to the bronchopneumonia but cocaine toxicity was a contributing factor: "If she had not taken cocaine in the past the probability is that she would have survived the bronchopneumonia, but we cannot be sure.
"Because of the bronchopneumonia she died of natural causes, this is not a drug death, the cocaine contributed but did not ultimately cause her death."
It was also noted that Miss Hughes' immune system would have been suppressed due to the fact she was pregnant. At the time of her death, her friend Helen Evans described her as "full of life" and a "brilliant mother".
"She was a devoted mother and partner, caring daughter and joyful sister - her death has left a massive hole in so many people's lives", she said.