My brother got in a lot of trouble with drugs. Came within a gnat's bawhair of getting sent down at one point about three years ago.
I blame him and my parents for it - 65/35 split. For ages we thought the people he was hanging around with were a bad influence on him, but then we realised he was the bad influence.
He has now pulled himself clear and is taking his job seriously, has a lovely little girl and a supportive girlfriend. I credit him and his girlfriend for the turnaround, 75/25.
Obviously every case is different, but it was his actions and his choices that strawberry floated him up and nearly utterly destroyed his life. Thank strawberry float for one very lenient Crown Court judge.