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We all know that Heroin causes heroin addiction, right? If you break your bones for example, you will be taken to hospital and given loads of diamorphine(二乙酰吗啡) for weeks and months. However, diamorphine is the purified heroin, so why don't you come out of hospital and become a junkie? Let's put it aside for a while. In a series experiments in 20th', one situation will always happen if you put a rat in a cage with two water bottles. One is just water, the other is laced with heroin or coccaine. The rat will become obsessed with the drugged water and keep coming back for more and more, until it kills itself. But in 1970s, Bruce Alexander, a professor of psychology, noticed that the rat is put in the cage all alone and has nothing to do but to take drug. This is odd. Consequently, he built called rat park (heaven for rats, has all the things rats want) , with the same bottles. Now this case is different, as almost no rats is gonna take the drugged water. Another human experiment called Vietnam War, 20% of American troops were using a lot of heroin,  people back in United States panicked worrying streets might be full of junkies after the war. A study followed the soliders home and found out that 95% of them just stopped the heroin after they went back. Thus, it might be connections or bondings that keep heroin away.
其实，成瘾机制的核心在于“生无所恋”。内心无所依靠，又毫无兴趣之事。才会不断追求成瘾所能带来的巨大快感。而这种巨大的快感会随着刺激次数的增加而逐渐减弱。
如何解释明星们吸毒？证明在娱乐圈中得到地位之后很容易迷失自我，生活其实毫无乐趣、毫无快感可言。这何尝不是一种悲哀？

A professor of psychology, noticed that the rat is put in the cage all alone and has nothing to do but to take drug. This is odd. Consequently, he built called rat park (heaven for rats, has all the things rats want) , with the same bottles. Now this case is different, as almost no rats is gonna take the drugged water. Therefore, he thinks that drug addiction takes effect while people have no connection or bonding in their lives. In this case, connection means relations with other people or affection in life, or something to devote to.