I know what people "say", and I know what he "said", but I often wonder if it's possible that he ingested as many drugs as has been claimed by him and others, and is still breathing and talking.
I've been around folks that have actually abused themselves like that, and none of them lived as long as I have.
Dean Martin had a reputation, much of it self-generated as "the lovable drunk" as part of his act, as drinking all the time. But people who knew him said otherwise ... Frank Sinatra said "I've spilled more liquor than Dean has ever drunk" ....
No one will ever really know about Pete though. Sexdrugsandrockandroll is a "thing" - reality may be different.