Decision

"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."
--Philip K. Dick,
"A Scanner Darkly" (1977)