Whether they are male or female, adolescents feel like deciding on everything themselves in spite of parents’ instruction, especially when they face proble***ike sex, mental stress, etc., which make them feel ashamed and embarrassed. Thus they often automatically get into troubles due to their imperfect comprehension and judgement. Some are addicted to cigarettes, only several packets of which will hurt their lungs and make them breathless quickly. Others can’t quit drinking alcohol, whose harmful effects include causing young pregnant women to abort or give birth to abnormal babies. The worst is drug abuse, for the withdrawal is tough once their bodies are accustomed to the drugs. Meanwhile, those who share needles bought from illegal chemists are at great risk of being infected with desperate AIDS. If so, neither injecting nor taking pills can guarantee their survival.