A toxicology report found there was evidence of cocaine use and the presence of cocaine and alcohol which probably caused the cardiac arrhythmia which led to his death.
Edwards died in February this year aged 31.
The coroner at West London Coroner’s Court heard that he had returned to his home in Acton at around 4am after playing a DJ set in north London.
He then sat up drinking with a friend who was living in an annex of the house.
Edwards became erratic and paranoid and began throwing objects around the room before collapsing, the inquest was told.
In June, his mum Brenda Edwards thanked well-wishers for the "outpouring of love and support" since his death.
She added: “Since I last spoke, I have sadly learned that the cause of Jamal’s devastating passing was due to cardiac arrhythmia caused by having taken recreational drugs and I wanted to address this myself to everyone who loved, admired and respected my son.
“Since finding out the news I’ve been in a state of shock, and I’m still trying to process it, but it’s so important to me that I do address it as no mother or any loved one should have to go through what Jamal’s sister, Tanisha, and I have been through since he passed.”
She described her son as having had the “world at his fingertips – a zest for life and he was unwittingly taken away far too soon”.
“Yet we have to come to terms with what has happened, and Jamal is proof that this can happen to anyone.”
She wrote: “These types of substances are extremely unpredictable, and we can only hope that this will encourage others to think wisely when faced with similar situations in the future. His passing has shown that any one bad decision on any one occasion can lead to devastating consequences.
“It’s so important that we help drive more conversation about the unpredictability of recreational drugs and the impact that they can have – how it takes just one bad reaction to destroy lives.
“I would do anything to have my son back but that is just not possible so if I can help save one life, then we will have achieved something.”
In the days after his death tributes came from Prince Charles, Idris Elba and Sir Richard Branson.
Edwards was the founder of SBTV, an online grime and rap music platform which he launched after his parents gave him a video camera as a Christmas present when he was 15.