Why is quitting so hard!!

[sld2]

I've tried so many times and can do really well for about 2 weeks and then I start all over again!  Help!  Right now I'm stressed with family problems, the Holidays, work - I feel like the weight of the world is on my shoulders!  I just started on Step 1 (again) today.  I would love, love, love, to get past two weeks!  Oddly enough - when I'm not smoking I feel fantastic, smell good and even look better so WHY do I go back!!!!