Yea, I would be very interested in the methodology they used to come up with that 70% and I am wondering if that is a snapshot in time or is that over someone's entire life. Addiction almost always starts out in a more controlled manner until its not. So if 50% of those 70% of drug users become full blown addicts, then its a BS number. I'm also really curious how they found those high functioning drug users, because I can't imagine anyone that is successfully hiding their use from the world would divulge it to anyone they don't know or trust ("hey, are you a high functioning drug user?" sounds like something a cop might say).