The 51-year-old star has apparently entered the facility because he was smoking "as many as 25 joints a day" before deciding to seek help at the Kusnacht Practice, reported Daily Mirror.
The "Faith" hitmaker had previously said a series of health scares and trouble with the law had convinced him to quit using the drug.
"I decided to change my life and I haven't touched it."
The treatment reportedly costs around 100,000 euros and has previously been sought by other famous names, including designer John Galiano.
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