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Celebrities who battled addiction: Zac Efron, Cory Monteith and more

9:13 AM, Sep 19, 2013   |    comments
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(CNN) -- There are some celebrities who are well known for problems with drugs and alcohol. 

But still others flew under the radar with their issues.

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A lot of people were surprised to learn that Zac Efron had gone to rehab. Take a look at photos of these other celebrities that you might not have know battled addiction.

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