To the process of leaving drug using groups and behaviors behind as one grows older and takes on more socially acceptable responsibilities.

Maturing-Out

Explanation:

According to my research on studies conducted on human development, I can say that based on the information provided within the question the term being referred to is called Maturing-Out. When a person matures they become fully grown or develop, and while they mature out of a certain stage they leave certain behaviors behind and adapt better ones.

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