Quotes about Heroin

Thousands are killed and injured every year by teenagers driving too fast or under the influence of drugs and drink... others are killing [themselves] with alcohol or heroin overdoses.

An interesting question these psychologists tend not to ask is why the muscle metaphor is apt. In other words, why is it that early successes at self-discipline lead to more successes, whereas early lapses lead to more lapses? If self-discipline is really good for the organism, you wouldn't expect natural selection to make it so easy for a few early lapses to destroy self-discipline. Yet there's no denying that a few injections of heroin can be the end of a productive life. Why?