The Vietnam veterans study pointed to a similar conclusion: under certain conditions of stress many people can be made susceptible to addiction, but if circumstances change for the better, the addictive drive will abate. About half of all the American soldiers in Vietnam who began to use heroin developed addiction to the drug. Once the stress of military service in a brutal and dangerous war ended, so, in the vast majority of cases, did the addiction. The ones who persisted in heroin addiction back home were, for the most part, those with histories of unstable childhoods and previous drug use
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