I never cared for Vaughters and just lumped him in with the Armstrong/Postal doping crowd. Reading the review of his book was pretty enlightening, The peer pressure aspect I've heard before, but not so bluntly. (It's funny; I was such a loser as a kid that I was never even on the outskirts of the peer group and those pressures missed me entirely. I was never pushed to either drink or smoke. I did fall into the pot crowd esp in college, but not by outside pressure.)
I like Voughters' observation that the doping peer pressure is entirely gone in today's peloton; that dinner conversation (for example) is about things normal men talk about, not drugs.