Heroin
Few who begin the use of this drug escape addiction, for heroin is its own best salesman. Somewhat like barbiturates, although more extreme, beroin produces a floating euphoria accompanied by a trancelike stupor. After a time it causes a fundamental change in the biochemistry of the brain to the point where one loses any voluntary chance of staying off the drug. Thus the heroin addict takes the drug not merely because he wants to, but because he has to. Adjustment to the drug's presence is gradual, but so is adjustment to its absence. Thus if an addict is without a "fix," withdrawal symptoms soon appear-sleeplessness, vomiting, sweating, and cramps.
