Which of the following drugs was used during the Civil War and became known as "the soldier's disease"?

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Morphine was widely used as a painkiller during the Civil War and many soldiers became addicted to it, leading to it being known as "the soldier's disease". Heroin was not widely used until several decades later. Cocaine and marijuana were also used for medicinal purposes during the time, but were not as commonly used as morphine.

Which of the Following Drugs Was Used During the Civil