Drug misuse is not a disease, it is a decision, like the decision to step out in front of a moving car. You would call that not a disease but an error in judgment. When a bunch of people begin to do it, it is a social error, a life-style. In this particular life-style the motto is "Be happy now because tomorrow you are dying," but the dying begins almost at once, and the happiness is a memory.
It was closer to manual labor than shooting a film. I always think of something Michael Caton-Jones told me: 'Pain is temporary. Film is forever. '