Im pretty sure all the musicians you know and love have at some point dabbled. Ive worked in music for a few years and couldnt name anyone who doesnt have a 'time they tripped out' on x,y or z story. Guess it comes from the creative side of em, and trying to deal with that side in a world which often fails to understand. Possibly its just the boredom of sat on a tour bus for hours and hours then sat in a venue for hours and hours waiting to play.
Jimi wasn't a junkie. He liked to take drugs, yes. But that doesn't make you a junkie! Unless you get addicted.
Vedder wasn't a real junkie either...One of his famous quotes is "I dont need drugs to make my life tragic."
Its true. The same goes for many poets, authors, and artists. Using drugs seems to go hand in hand with an artistic mindset. As a poet myself, I find that my own intuitive grasp of my interaction with the world around me is expanded exponentially with the use of drugs. However, as Eddie Vedder's quote posted earlier says, "I don't need drugs to make my life tragic". But, they are certainly a useful portal to "the other side".
Brad Nowell - 1968-1996 - Died in May 96' from a Heroin overdose while on a tour, he od'd in a hotel room somewhere in california...such a great man, too bad hes no longer around to make more new great music...A lot of his songs are actually about his struggles with Heroin addiction..