Philosophical involvement blinded me to authentic human fact. - Philip K. Dick

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 of judgment.

Too bad, Matson thought archly, that George Hoffman didn't discover more planets in more star systems habitable by us, the frail needs of living, sentient, mentating biochemical upright bipeds which we humans are.

He could not endure what he found himself going through, and he could not get away. It seemed to him as if he sat behind the tiller of his custom-made unique quibble, facing a red light, green light, amber light all at once; no rational response was possible. Her irrationality made it so. The terrible power, he thought, of illogic. Of the archetypes. Operating out of the drear depths of the collective unconscious which joined him and her — and everyone else — together. In a knot which could never be undone, so long as they lived.
No wonder, he thought, some people, many people, long for death.