Total horseshit.
Ive had a minor xanax habit for a short while in my life. I failed to control my using of it until the time soon came where I decided this wasn't even close to pleasurable enough for me to justify the cost. Well, that and me and my bf had just flown interstate to see my family for Christmas, an extraordinary amount of stress for me. But instead of holding on to enough pills I kept quickly going through them till ran out when I needed them most. Very stupid of me I know. I was fairly confident I could easily beat xanax when at that point I hadn't even been using that long. I was wrong, turns out at the very least for me... Dependence to alprazolam occurs amazingly fast.
So I find myself stuff in an ultra stressful situation, no xanax or anything similar (and no answer from any contacts I used to have in the city we'd flown too where my mom lives. It wasn't fun, it sucked. Come Christmas day I'm sick and too anxious to move or say anything. Wonderful, I'm already the family black sheep I'm sure they appreciated me ignoring them all. Also wound up drinking a LOT and smoking a lot of weed (after someone had finally called back).
I still use other benzos, but never xanax ever again, nor any other benzos with a similar half life. Ive taken diazepam with its very long half life a day or so in any given month for years without escalating my use or dosage or anything like that.
With that out of the way, heroin isn't even close to the same thing. Been a IV heroin addict much longer, have found it extremely hard to control my use of. Even on methadone maintenance the psychological longing for it is hard to handle for me.
For me, and I suspect for most by far, heroin is waaaay more psychologically addicting. As for the withdrawal, mine from xanax were only mild thanks to not having done it that long, but im still amazed I had any. And whole it was minor compared to what I hear it can be, It was still very unfun and took weeks to resolve.
But nothing compared to heroin withdrawal which I have experienced as the consequence of going cold turkey from over 1 gram of heroin a day for some time. Now that is hell. I'm sure with the right kind of use xanax withdrawal can be even worse hell perhaps.
But if only for me I don't see it ever being a drug ill crave. I just don't have that much daily anxiety during most of my daily life to enjoy it at all.
Just my take on it.