Yes, one day at a time! I'm an ex-smoker and am very proud of you - keep it up - you CAN do it.
ETA: I somehow missed your very last post. I'm sorry. But, hey - you know what? All is not lost. Just pick back up where you were and chalk this up to a minor setback. It will be OK and you CAN do it. It is JUST a minor setback - it's OK, just move past it.