Mixing cocaine and alcohol together creates a "deadly combination" which can increase violent and impulsive behaviour, doctors are warning.
At least 13 "self-inflicted" deaths happened in a year in England among people who took the two substances, the Victoria Derbyshire programme found.
Many, including two contestants on Love Island, took their own lives between April 2018 and March 2019.
Coroners have reported seeing a rise in such cases.
Victoria Derbyshire programme's Anna Collinson reports.