As his career was taking off in the early 1960s, Cash started drinking heavily and became addicted to amphetamines and barbiturates. For a brief time, he shared an apartment in Nashville with Waylon Jennings, who was heavily addicted to amphetamines. Cash used the uppers to stay awake during tours. Friends joked about his "nervousness" and erratic behavior, many ignoring the warning signs of his worsening drug addiction. In a behind the scenes look at "The Johnny Cash Show", Cash claimes to have "tried every drug there was to try".
key words - early 60's
it didn't last, he quit within a few years
gotta keep things in perspective, he was a musician, not a presidential candidate.