I know he was a pothead, and I presume he still is. I know he used to use tobacco and I have no idea if still does. I don’t know about other drugs, or alcohol. I still think he’s very talented and can still rock, but his pipes are nowhere near where they used to be.
Preludin (speed). LSD. Benzedrine. Pot. Alcohol. Paul McCartney admitted to using all these. Tobacco as well. But perhaps British cooking may have had deleterious effects as well...