But some in the field point out that many if not most addicts successfully recover without professional help. A survey by Gene Heyman, a research psychologist at McLean Hospital in Massachusetts, found that between 60 to 80 percent of people who were addicted in their teens and 20s were substance-free by their 30s, and they avoided addiction in subsequent decades. Other studies on Vietnam War veterans suggest that the majority of soldiers who became addicted to narcotics overseas later stopped using them without therapy.

Further detail at "Ask The Experts" in Scientific American

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