Let me analyze it for you, because teenagers are in a rebellious period and have no completely independent thinking and personality shaping. In this case, they are easily influenced by the outside world and even imitate themselves. For example, some books and movies are more exciting and emotional, so they are more popular with teenagers and even adults.
Therefore, this common phenomenon not only happens to teenagers, but also is a social problem. Normal treatment and patient guidance and teaching of young people are the right way.