Pat, he (Ellis) says at the start of his most recent book, Lunar Park, that indeed Less Than Zero was written during a crystal-meth binge..."I had written it quickly in an eight-week crystal-meth binge on the floor of my bedroom in L.A..
Anyway, I haven't read it but desperately want to. I only got into the author quite recently. American Psycho is probably my favourite book ever, and I am engrossed in Lunar Park at the moment. Just about to go and finish it right now.
I'm currently in the process of tracking down all of his novels.