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A person who has used crack for a prolonged period may need medical and mental health assistance for a variety of problems for the rest of their life

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Methamphetamine delivers intense euphoria and alters brain chemistry, contributing to compulsive use

In the daily diary study, we calculated intraclass correlation coefficients (ICCs) representing average agreement across observations within participants, following multilevel mixed-effects logistic regression models with participant-level random effects, to assess the proportion of variance attributable to between-person differences over time