High School Musical Star, Zac Efron, Was In Rehab For Cocaine! Turns out that Zac Efron was not in rehab for an alcohol problem. He had a cocaine problem. He went to rehab back in April because of his major addiction. He would be a no show for a number of days on set. View the video from TMZ below. Advertisements Share this:TwitterFacebookGoogleLike this:Like Loading... Related Talkers Tell Me What You Think! Cancel reply Enter your comment here... Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. ( Log Out / Change ) You are commenting using your Twitter account. ( Log Out / Change ) You are commenting using your Facebook account. ( Log Out / Change ) You are commenting using your Google+ account. ( Log Out / Change ) Cancel Connecting to %s Notify me of new comments via email. Notify me of new posts via email.