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A US soldier from the 9th Division smokes a long pipe whilst sitting in long grass, 1968.

In 1969, a Defense Department study showed that 20 percent of US soldiers in Vietnam were using marijuana either occasionally or frequently. Heroin use also spread within a small group of soldiers and was readily available for only 2-3 dollars per dose. Drug urine analysis tests were performed on some soldiers before returning home. However, the majority of the soldiers did not use drugs as popular myth may suggest.