I am new to this experience as I have only been banded since August 11, 2008. But I can relate to your experience and just tell you this: FOCUS ON YOURSELF! The nicest, most respectful and honorable thing you can do for you in your situation is to remember that you are on a path to get control of your life and your health. You can't worry about what others around you -- even those in your on family -- are eating because that then takes the focus away from you. Easier said than done, I know. But I am convinced that a big reason I find myself in my situation is because I was always focused on everyone else and ended up using food as my reward -- my way of doing something "extra special" for me. And we all know where that ends up!
As for the smoking -- yeah, I know it's hard because I watched my mother go throught kicking the habit and it was no joke. But listen: I also watched my father, who was a life smoker, snuffed out by lung cancer. Trust me, you will so thank yourself a thousand times over for letting that habit fall by the wayside.
Sodas -- just crap, sweetie. Good riddins! Same for me and my sweets addiction -- never met a candy, cookie, or ice cream I didn't like and I just had to say buh-bye, you know? I haven't even started solid foods yet but have gone from a 22/24 to a 14 in my tops. Candy -- what's that!
Hang in there, chica!
P.S. I am in charge of the dinners in our family and I do exactly what Restless Monkey suggests: for now, until my resistance is stronger, I make myself scarce when it's mealtime. If I didn't, I'd probably be writing the same posting as the one you posted. Breathe...and be kind to yourself.