Pretty sure he also did Pervitin (like most people involved directly in the war effort). At the time, they even put that stuff in chocolate bars.
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Incidentally, someone who very nearly fucked up the entire world because of drug abuse was John F. Kennedy, who was on a concoction of amphetamines and other dumb bullshit while at Vienna, purportedly for back pain, but it wore off, giving Khrushchev the impression of weakness, which is why he felt emboldened to go to the brink of war over the missiles in Cuba.
Drugs are bad, mmmkay?
Sources say it was an early form of methamphetamine. They mostly stopped using it after some bad results.