World champion Ronnie O'Sullivan has revealed he feared being caught by drug testers and "pushed his luck" between tournaments early in his career.
O'Sullivan, who won a fifth world title in May, has had well-documented issues with drink, drugs and depression.
"I remember getting to every World Championship and thinking, 'I can't wait 'til this tournament is over'," O'Sullivan wrote in his autobiography.
"'Cos then there's no more drug tests, I can go out and smash it.'"
The 37-year-old lost his 1998 Irish Masters crown after testing positive for cannabis and suffered numerous problems as he looked for stability on and off the table.
With both parents jailed for different offences, O'Sullivan's private life was rarely not mentioned, and he had spells in the Priory clinic to treat his addictions.
"I'd got caught once in my career, but that's all," he stated in his new book 'Running', which is being serialised in the Sun.
"I'd get tested between events, and I was trying to judge it perfectly so there'd be no drugs left in my system, but I was pushing my luck.
"My mum said to me, 'You are going to get caught soon. You can't carry on like this'."
Stability has followed in later life and O'Sullivan's win at the Crucible this year saw him become the first man to successfully defend the title in 17 years.
He claims, though, that the sport often got in his way of seeking a good time.
"When I was having my weekly benders and my private life was in bits, I had a brilliant year professionally," he said.
"I loved a joint. The only problem with a joint is that one spliff follows another, and another," he added of his cannabis use.
"(I would have) any old drink, it didn't matter. Throw in a few spliffs. Then at 7am the sun would come up and I'd think 'I've done it again'. The birds would be tweeting and I'd think 'I'm bang in trouble'.
"At my worst I had to have a joint first thing in the morning just to function. But loads of time snooker got in the way of my benders, rather than the other way round."