My guess is that the interviews started off pretty well 100% truth, and once he realized how much of a kick getbig got out of the interviews, he started to exaggerate things for entertainment value.
Dave Palumbo really doesn't strike me as the major recreational drug addicts. He is one of the very few top amateurs/pro bodybuilders who I would say is actually extremely smart and off the top of my head, I wouldn't be able to count 10 who I would classify as such. Although that is in part because it's 4:40AM right now and I am going to bed. Justin Harris is an obvious exception as he is brilliant, and there are a few others, but anyway, my point is that drug addicts don't usually articulate themselves as well as Dave does and if he does have an addiction he hides it very well.
The validity of Nasser's comments - discuss.