What are the reasons why most adolescents experience poor health or health deficiencies?

Answer:

Injuries. Unintentional injuries are the leading cause of death and disability among adolescents.
Injuries. Unintentional injuries are the leading cause of death and disability among adolescents. Violence.
Injuries. Unintentional injuries are the leading cause of death and disability among adolescents. Violence. Mental health.
Injuries. Unintentional injuries are the leading cause of death and disability among adolescents. Violence. Mental health. Alcohol and drug use.
Injuries. Unintentional injuries are the leading cause of death and disability among adolescents. Violence. Mental health. Alcohol and drug use. Tobacco use.
Injuries. Unintentional injuries are the leading cause of death and disability among adolescents. Violence. Mental health. Alcohol and drug use. Tobacco use. HIV/AIDS.
Injuries. Unintentional injuries are the leading cause of death and disability among adolescents. Violence. Mental health. Alcohol and drug use. Tobacco use. HIV/AIDS. Other infectious diseases.