By the letter of the law, drug addicts are criminals as they trade in, use, and sell a controlled substance.
As to the spirit, no I wouldnt say they were. People close to me have had struggles with drugs and after a while it becomes less of an "I want" as an "I need" where withdrawal produces violent physical symptoms and the brain chemistry starts forming a dependency.
Socially, I think it does us a disservice to treat addicts like criminals. The vast majority of drug abusers are people who do want to be clean, but it's hard to fight brain chemistry.
See my last post