... Substance Use and Abuse According to "Adolescent Substance Abuse," author Bernard Segal states, "substance abuse is the excessive use of a substance, especially alcohol or a drug."" (Segal 194) Many American teenagers use more than one substance, whether it is using multiple drugs or a combination of drugs and alcohol. Being dependent on more than three substances, is called polysubstance abuse, and ... most teenagers who are classified and treated for drug abuse fall into this category. Statistics and Epidemiology: Patterns of Abuse Although the United States is home to only 5% of the ...

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