I'm starting to think of my writing group as a bizarro Anonymous-type support group. Yes, I have a habit, and my writing group supports my habit. I have no problem sharing details about my habit, and I don't apologize for it. Also, wine is by no means frowned upon. In fact, it is encouraged.
I met with my writing group recently for the first time in a long time. It's been a long time because life happens. We have jobs. And families. And we're just busy living life. Even during unproductive times, checking in with a writing group helps keep goals in sight. Sometimes that's all we accomplish, talking about projects or what's coming up next or just how we haven't had time to write anything. Sharing can be cathartic and prods us to go home and write, encouraged anew. And when we do have pages to read, the feedback and criticism we give each other is vital to improving each other's work. But even if I'm not writing, the support I get from my writing group helps my habit.
A writing group can be so good for your writing habit that some might advise against it. Over at Bill and Dave's Cocktail Hour, starting a writing group is their bad advice for the week.