How do I convince my son to undergo drug rehabilitation?

My son has been hooked to drugs since his college years. After high school, he decided to move out of the house. He told me he tried drugs only so he can fit in. He never thought he’d get hooked. But now that he’s been out of school for two years now and is still hooked to the habit, I am very much worried about him and his future. What should I tell him to give drug rehabilitation a try?

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