（一）心理依赖是脱瘾者复吸的最主要原因。研究证明，所有毒品，包括吗啡类、巴比妥类、可卡因类抑或大麻类，都能致使吸食者产生心理依赖。所谓生理依赖指的是吸毒者因反复使用毒品而使中枢神经系统发生某种生化或生理变化，以至需要毒品保持在体内，以避免出现或戒断综合症 (A) psychological dependence is the most important reason for relapse. Studies have shown that all drugs, including morphine, barbiturates, cocaine or cannabis, can cause a psychological dependence on those who smoke. The so-called physiological dependence refers to drug users who have some kind of biochemical or physiological changes in the central nervous system due to repeated use of drugs, and even need to keep the drugs in the body to avoid or abstinence syndrome