There's actually a book written about how drug fuel the Nazis were in WWII
Blitzed: Drugs in the Third Reich
That's not to say the US didn't do the same thing.
He was a junky pretty early on. Just like the whole Wehrmacht was running on 'Panzerschokolade' (tank chocolate):
https://www.amazon.com/Blitzed-Drugs-Third-Norman-Ohler-ebook/dp/B01IAS9G94
Lots of drugs, especially later in life. Specifically oxycodone, morphine, and amphetamines. There is a great book about it called Blitzed.