It seems it's almost de rigeur for anytime long-time successful musician to have his/her bout with heroin. See Eric Clapton and Jimmy Page as two examples.
Dylan & Joan Baez, 1963:
PIF: "Does it mention he was/is addicted to heroin?"
In 1984 Dylan himself refuted his 1966 claim that he had a heroin habit when he first moved to NYC in 1961, then age 19.
At age 83, Dylan is still performing, his most recent US performance was April 24, 2024 in Austin, Texas, and that "Rough and Rowdy Ways Tour" ended on November 14, 2024, at Royal Albert Hall in London.
(left) Dylan in 2019 -- (right) 2024 Rough and Rowdy Way's Tour:
