Billy Idol thinks he may have ADHD Billy Idol has pondered whether he started taking drugs because he has undiagnosed ADHD. 20 March 2026 Billy Idol believes he may have become a drug addict due to undiagnosed ADHD. Billy Idol has questioned if he has ADHD The Rebel Yell singer - whose years of excess and struggles with addiction are documented in new documentary Billy Idol Should Be Dead - has spoken openly about his dependency on heroin and other illegal substances, and after his son William was diagnosed with Attention Deficit Hyperactivity Disorder as a child, Billy has pondered whether hi...