In a long-term study of heroin users, about ______ of the subjects were dead by age 46, with drug overdose being the most common cause of death.

Name: In a long-term study of heroin users, about ______ of the subjects were dead by age 46, with drug overdose being the most common cause of death.
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Studies on long-term heroin use indicate that approximately 50% of users may die by middle age, with overdose being a leading cause of death.

In a Long-Term Study of Heroin Users, About ______ of the Subjects