"If you saw the ruins it left behind, you'd be pretty confident I won't take that drug again."
Last April, a month after reaching a career-high ranking of 41, Britain's Dan Evans failed a drugs test at an ATP event in Barcelona. He had taken cocaine out of competition four days earlier.
This weekend, the 27-year-old will attempt to qualify for the ATP Challenger Tour event in Glasgow, having been awarded a wildcard by the Lawn Tennis Association on his return from suspension.
Evans is full of regret.
"It's a shocking drug, and it's not just in sport - it's terrible in life.