Many fans have concluded that Aaron Lewis of Staind had an addiction due to some of the lyrics in the songs he has written in the past. Aaron himself has never publicly admitted to having an addiction, or what he is/was addicted to, but speculation points to coke.
Songs like "It's Been Awhile," and "Outside" are what really set off all of the speculation and interpretations concerning his supposed past drug addiction.
Jason Newsted, former bassist of Metallica, just announced 2013 tour dates, and he will be joined by Mike Mushok, the guitarist for Staind. To check out tour dates, go here.