Drug use is not a problem in my circle of friends - I have friends who have done LSD, molly, coke, and countless others. They're all productive and mostly well-adjusted. This is mostly a Burning Man, techie set, there are also a fair number of qualified mental health professionals.
Honestly, I don't think a book on white-collar drug use is a good idea - it's too broad a topic.
I would either focus it on unproblematic (and possibly beneficial) drug use or drug abuse - those are too radically different phenomenon, to conflate the two will definitely undermine your credibility.
Based on your past work it looks like you're targeting drug abuse, so I would just stay focused on that, especially what factors differentiate it from general drug use by responsible, informed people.
Honestly, I don't think a book on white-collar drug use is a good idea - it's too broad a topic.
I would either focus it on unproblematic (and possibly beneficial) drug use or drug abuse - those are too radically different phenomenon, to conflate the two will definitely undermine your credibility.
Based on your past work it looks like you're targeting drug abuse, so I would just stay focused on that, especially what factors differentiate it from general drug use by responsible, informed people.