I think some people are over-analyzing this a lotttt lol, it's pretty much common sense.... IDC how normal you are, if you're addicted to a substance like alcohol, opiates, benzos, etc. you are going to have extreme mood swings, depression, euphoria when coming clean, and all that. I don't see how it is really possible to make a diagnosis before someone gets clean, unless they had clear signs of BP before ever using. I think substance induced bp is fair to say for a lot of people, but really what can that even solve? I can't imagine that taking meds on top of street drugs or alcohol would be a good idea. Therapy/rehab would seem to be the best bet.