It has also been used as treatment for alcohol addiction.
Collins has been open about his alcohol addiction ever since.
Kyle's early life was difficult because of his mother's alcohol addiction.
He developed an alcohol addiction and his health began to decline.
Unlike five years earlier, his alcohol addiction received much publicity.
During the court hearing he admitted to suffering from alcohol addiction.
"I never had any alcohol addiction," he told a visitor.
During the following season, Carlisle developed personal problems, including an alcohol addiction, although he continued to play for a number of months.
Their relationship was complicated by his drug and alcohol addiction, but eventually he became sober.
"You don't need a higher spiritual power to get rid of alcohol addiction," he said.