Yes, also. But it was a mix of multiple drugs. That's why he developed a tremor in his left hand. That's why his orders get more crazy over the years. Not because he got "mad" but becuase of the drugs he got.

You really think a genious who invented Blitzkrieg makes such bad descisions all of a sudden? Makes no sense other than the hard drugs he got. Clouding his military geniousness.