Some time ago I was in correspondence with a drug addict who showed great interest in the Jodo Shinshu teaching. He had a hard time trying again and again to give up taking drugs but he always returned to his bad habit. More than this, he was afraid that he cannot be saved by Amida as he is.
Jodo Shinshu is the path for sick people, for those without hope. Its the path for alcoholics, drug addicts, and all kind of people with strong attachments. All are equally accepted by the Compassion and Primal Vow of Amida Buddha. So please, come as you are. Your salvation is in Amida's hands, not yours.