Well, he used to be the lead singer of the band "Three Days Grace". He decided to leave the band almost one year ago. But that isn't what I want to talk about.
He had a really tough time struggling with drug addiction, and he went to rehab to CAMH (Center for Addiction and Mental Health) in Toronto, Canada. That whole situation was put into a documentary called "Behind the Pain". He isn't addicted anymore, he is sober. Anyway I really recommend you to watch the documentary, even if you're not a fan of whether 3DG or Adam, it's a really good documentary and really beautiful one too. It really touched my heart. Even you'd like to know that a lof of the songs from the album "One-X" by Three Days Grace were written about that by Adam in CAMH.
Here you can watch it bellow: