By Dr. Brian McDonough, Medical Editor

PHILADELPHIA (CBS) – Finally some good news regarding teens and substance abuse.

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According to the National Institute on Drug Abuse, the rates of substance abuse among high school students continue to decline. This is based on a yearly poll of over 40,000 high school students.

It found that cigarettes, alcohol, prescription drug and over-the-counter drug abuse have declined over the last year in this age group.

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Perhaps the most exciting news is that cigarette use went from 6.7% to 3.7%.

The news is not all positive, however. The rate of marijuana usage has not decreased and of particular concern is that e-cigarette use has now surpassed that of cigarette use in these age groups.

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Many teens are not aware of the dangers of e-cigarettes. It does appear that preventive measures are helping.