A TED talk analysis

Considering the TED Talk by Johann Hari and the information provided by Goode, what are some possible explanations for the increasing use of heroin and other opioids in the U.S.?

LINK TO BOOK:

https://ccis.vitalsource.com/reader/books/9780429514920/epubcfi/6/30[%3Bvnd.vst.idref%3DCh07]!/4[ch