He's sharing his past with his audience. He's sharing his past struggle in order to show others that they're not alone and to inspire them to find help for their addiction. Of course, he's not going to be an inspiration to everyone that reads his stuff. But if he can help one person I'm sure that's something to be happy about.
I totally agreed with you!
I agree to donnaincacun and masteranibal! Its very hard to surpass thats addictions, and sharing its a great way to inspire other people to grow up and be more happy