This question, in all its forms, has come up here a fair few times over the past few years, so you're in luck: the estimable u/commiespaceinvader has led discussions on the topic a number of times. There is always more to say, but you might like to review some of the material they produced while you wait for fresh responses to your query:

• There is a thread on r/books about "High Hitler", a book about Hitler's drug use. Is this book considered to be accurate?
• "Hitler was a gibbering super junkie, whose veins collapsed after thousands of injections..." These are historian, Norman Ohler's words. I doubt they're at all true but humour me. How prevalent was recreational drug use amongst the German people and the Nazi elite?
• Documentary claimed Nazi soldiers were hooked on methamphetamine's to make them feel invincible in the face of battle. How true was the level of use among soldiers, and who or what types of soldiers was the use more rampant if at all?