"You actually end up believing your own lies. You become part of them," William says. "They become your reality, actually, after a while."
Resisting drugs or alcohol is a daily struggle for most addicts, but Rick says there's one thing that's even more difficult than staying clean.
"Even harder than quitting the drug, getting off the drug, is forgiving yourself," Rick says. "I'm almost eight years clean, and I still loathe myself at times because of what I did years ago. I may be out helping kids every day and speaking at schools. … But I still go home at night and say, 'It's not enough. I don't forgive myself yet.'"