I know warren takes valium and things like that though, which I don't agree with. But eh, that's his decision.
Never done Valium, but I'm not exactly disinclined to try it once.
Only substances I've abused are Pot, Vicodin when it was prescribed to me, and I guess Tobacco if that counts.
I'm in the process of quitting cigarettes, and I haven't touched the Vics in like a year.
Also I've never drank alcohol, which many can't say the same.