A regular cannabis user and heavy drinker took his own life after years of suffering from mental health problems, an inquest heard.
Jonathan Burrage, of Hudson Court, Pincott Road, South Wimbledon, left his family home and went for a walk in the early hours of January 6 and never returned.
His dead body was found by a police dog walker in Morden Hall Park, senior coroner Fiona Wilcox heard.
Mr Burrage, 27, began using cannabis daily aged 12 and was later diagnosed with an unstable personality disorder.
He had previously been under the care of the Wimbledon community health team and at the age of 17 had suicidal thoughts and was self-harming.
The hearing on Tuesday, March 11, at the Royal Courts of Justice in London heard Mr Burrage used alcohol excessively and occasionally took magic mushrooms as well as cannabis.
A postmortem examination at St George’s Hospital found numerous self harm scars and the cause of death as a ligature impression of the neck.
Dr Wilcox said: “He had a long history of the misuse of cannabis.
“He drank alcohol every day – up to 11 cans a day.
“He was last seen by his sister Victoria. At 2am he was heard to leave the flat, closing the door, which wasn’t unusual.
"He would often walk at night and sleep in the day.
“I find Jonathan Burrage took his own life while intoxicated on cannabis.”
Dr Wilcox recorded a narrative verdict