[Answer] 7. A study by Harvard University and the Centers for Disease Control found that teenagers who watched 5 or more hours of television a day were six times more likely to acquire this habit than their peers who watched less than 2 hours of TV a day.

Step 1 : Introduction to the question "7. A study by Harvard University and the Centers for Disease Control found that teenagers who watched 5 or more hours of television a day were six times more likely to acquire this habit than their peers who watched less than 2 hours of TV a day."

...1. Smoking 2. Exercising regularly 3. Reading for pleasure 4. Writing in a journal daily The study found that the more TV teens watched, the more likely they were to begin smoking. The researchers were especially concerned with the positive portrayal of smoking in music videos. Another study found rap music videos to be the biggest offenders in this area.

Step 2 : Answer to the question "7. A study by Harvard University and the Centers for Disease Control found that teenagers who watched 5 or more hours of television a day were six times more likely to acquire this habit than their peers who watched less than 2 hours of TV a day."

Smoking:

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