一、引言在当今世界上,毒品问题已经成为一个全球性的社会问题。据世界卫生组织提供的材料,当前至少有500万人注射毒品,而以吞、吸、饮、嚼的方式吸毒的人数则更多。80年代全世界吸毒死亡的人数达10万。国际上通常把毒品分为9大类,其中对人体危害最大的有三类:即鸦片类、柯 I. INTRODUCTION In today’s world, the drug problem has become a global social issue. According to the information provided by the World Health Organization, at least 5 million people are currently injecting drugs while the number of people who consume drugs by swallowing, sucking, drinking and chewing is even more. In the 1980s, the number of drug abusers in the world reached 100,000. Internationally, drugs are usually divided into nine categories, of which three types are most harmful to human body: opium,