The Dear Sugars podcast featured love and addiction in their latest episode:
A Spy In The House Of Love ? With Ariel Levy | Dear Sugars
Definitely worth a listen. What I find interesting (and is not mentioned in the podcast) is that Cheryl Strayed flirted with heroin use in the past (she insists that she wasn't at the addict stage, but was getting pretty close). Her ex-husband and her friend staged a dramatic intervention and she got clean (this happened before her hike up the Pacific Crest Trail, which she wrote about in "Wild".)
And yet, she STILL endorses the advice given in this episode, based on her own experience on the other side when another friend became a crack addict.