The mother of a 28-year-old Pembrokeshire man who died after drinking poppy tea has warned others that there is no "safe dose" of the drink.

Tristan Fredric Owain Roberts died on September 4th 2009 from an overdose of morphine and codeine.

Pembrokeshire coroner, Michael Howells, heard that Tristan, who was a team leader at Blueskys organic garden, had lived with mental health problems since his late teens.

On September 2nd he visited his friend Brian Cocks at Llanycefn The friends spent the next two days together, on both evenings they ate a meal, drank cider and then drank around three cups of poppy tea.

On the night of September 3rd they stayed up all night chatting and listening to music before going to bed at 7am.

At around 8.30pm on the evening of September 4th another friend, Nigel Fairman, arrived and went to wake Tristan up. He tried to rouse him before calling Brian, shouting: "He's not asleep. I think he's dead."

Both men tried to resuscitate him before paramedics arrived.

A post mortem examination concluded that Tristan had died of an overdose of morphine and codine.

The inquest heard how poppy tea contains morphine, a powerful analgesic drug which surpasses the central nervous system and can depress the respiratory system.

The Pembrokeshire Coroner ruled that Tristan died from a self administered dose of illegal drugs.

"This is a sad case of a young man who had certain mental health problems who consumed what may be regarded as an innocuous substance" he said.

"The concentration of drugs in his body depressed his breathing to such an extent that he died while at the home of his friend.

"The process of manufacturing your own drugs not safe. It is so easy to get it wrong. That's the message I want to get across."

In a statement after the inquest Tristan's mother,Sabine, paid tribute to a son who was a keen observer of wildlife, loved hard physical work and football, who was sociable and had a sharp and quick-witted sense of humour.

"Tristan was not in the habit if taking drugs other than alcohol and prescribed medication," she said.

"He knew that mental ill health and street drugs were not a good combination. Every day Tristan had to battle to overcome the many fears that he suffered through his illness.

"His illness impaired Tristan's judgment and perhaps, along with many people, he believed that a completely natural substance such as poppy seeds could not be fatally dangerous.

"It is vital to be aware that wholly natural substances can be fatal. The local police had never heard of poppy tea before and although you need a fair amount to reach a fatal dose that fatal dose is different for different people.

"Tristan died of a high dose and yet on the internet somebody will tell you that a fatal dose would be much higher."

She also stressed that people with mental health problems are vulnerable and that it is highly irresponsible to offer them drugs.

"Do not offer them drugs. Do not encourage them to take drugs. Actively discourage them from taking drugs," she said.