Yes, he talked about it once on TV. But it was talking about people taking ILLEGAL drugs, not people abusing legal drugs.
Remember, Rush was taking legal prescription drugs, not smoking crack.
The vast majority of the quotes are from the same show in October of 1995! This man has been on the radio for three hours a day, five days a week, since what - 1986? - and he is a hypocrite because he spoke out against drug abuse for a few minutes in some 23,000+ hours of air-time?
Lets be clear, he spoke out against marijuana, cocaine, heroin, and crack use. If he then turned out to be using any of those drugs, I'd be the first to label him a hypocrite. He had a legitimate reason for starting to use pain killers - he apparently wasn't using them for recreational purposes - and he got hooked. He possibly did some illegal things to obtain more because as you take pain killers over time, the relief they bring is lessened.
I don't see how you can honestly compare this behavior to the guy who shoots up with heroin or the woman who prostitutes herself to get another crack rock.
One other point, the VAST majority of the web sites that trumpet Rush's "hypocrisy" are either advocating drug use or are way left-wing.
Which are you?