The Paris Review interviews Biblioklept fave Sam Lipsyte. From the interview–
I’m not sure why you love reading about drugs. Maybe at a certain point the reading high is better than actually doing them? That could be preposterous though. I guess I’ve written about drugs a good deal because for a time, in my younger days, certain hard substances were the major elements in my life. My movements and decisions revolved around them. I like to pretend it was all some meaningless blur, but it was a very intense and focused time. I had a daily purpose (to get more drugs) that heightened the experience of being alive (a heightening then nullified by the drugs). I felt very alert during the mission phase of the day. Make no mistake, it was a horrible time, but I’ve always been fascinated by that robotic intensity. Also, it’s a way to give your character something to do, and we all know you have to keep those fuckers in motion, or readers might find out they are just constructions in a fiction! I try to make sure the drug-users in my stories aren’t acting high. Most of them tend to do drugs to get straight anyway. They are in that awful place. So their interactions might seem slightly off, but mostly these could easily be people not doing dangerous drugs. It’s just that occasionally they die from their addictions or else make really bad decisions that lead to more misery. That’s where the comedy kicks in. Drugs are hard to resist for some people because they work really well. And then don’t. But you find that out later.
Many books have been written depicting drug addictions, drug addicts and how drug addiction treatment centers actually work, with varying degrees of consistency.