text: Zac Efron completed a rehab program in 2013 without the media being any wiser about his problems, but the actor's now speaking out about his difficulties with drugs and alcohol. "It's a never-ending struggle," the 26-year-old told <a href="http://www.hollywoodreporter.com/news/zac-efron-career-reinvention-addiction-699529" target="_blank" target="_blank">The Hollywood Reporter</a> in its May 9 issue.