He said: "I smoke my head off. I smoke weed all the time. There, you've got
it.
"But that's all I take, all I do. I do smoke and I've got some really good
hash."
Referring to his heavy drug use in the 60s and 70s, he added: "People
thought I was going to die. I never did - as you can see. The drugs? Oh
yeah, they were great.
"Now I'm on medication. Drugs now? It's a dodgy subject."
Keith's substance abuse earned him a notorious reputation as a hellraiser.
The 64-year-old rocker was arrested on five separate occasions for
drug-related offenses, and at one point was believed to have regular
full-body blood transfusions to clean out his system.
Last year, Keith claimed to have snorted his late father's ashes.