Robert Downey Jr. first tried marijuana when he was 6, and developed a serious drug problem by age 22. He battled addictions to cocaine, heroin and other drugs. Since his release from rehab in 2002, he has remained sober.
David Bowie was hooked on cocaine in the early to mid 70s, eventually resorting to injecting the drug straight into his system. It wasn't until Bowie was given custody of his young son in the late 70s that he kicked his addiction.
Steven Tyler was addicted to heroin and stimulants in the late 70s and 80s. After he collapsed at a show in 1984, Aerosmith arranged an intervention and he was checked into rehab.
Tyler began using drugs again in the 90s, and has since kicked his long lasting drug addiction.
Cedric Bixler-Zavala and Omar Rodriguez-Lopez (The Mars Volta) both got clean in 2005 following the death of fellow bandmate Jeremy Michael Ward.
I have a lot of respect for those strong enough to overcome their battles with drugs and remain sober. This is a list of celebrities that have not only survived their addictions, but have defeated them and remained sober.
Always open to suggestions. :)