Cross-Addiction To Hard Drugs?

I'm wondering how common that is, since we hear about the "lesser" cross-addictions on here from time to time, but it seems we never hear any cases involving WLSers that didn't do drugs at all before their surgery and now are really into it deep. 

I don't really expect anyone to talk about their own situation here, given the sensitive subject matter,   but maybe you can (anonymously) relate some story(s) you have about friends or family who are WLSers that have fallen into it?      Were they eventually able to pull themselves out of the problem, and if so, how? 

Back in the Dec-Jan timeframe, someone here on the Men's Forum went into a helluva lot of detail on his own post-op struggle with prescription pain killers.  It was both harrowing and inspiring.  I won't identify him (he can do that himself), but he posted it all in public forum messages. /Steve