Failed - will power?

I failed miserably today...........I didn't have will power.  Why did I have it yesterday and not today.  I started out terribly.  I woke up and had a cig.  I kept thinking, ok, I'll only have this one and then not have any for the rest of the day.  I knew I goofed up but thought it would have been a slip.  No.......after that first one, I wanted another, and another, and I then bargained with myself and said that I would try again tomorrow.   I AM A FAILURE AT THIS.  Maybe the doctor will help me out with this tomorrow.   I MUST QUIT, THERE IS NO OTHER ALTERNATIVE, I MUST QUIT OR I WILL CONTINUE KILLING MYSELF BY SMOKING!!!!!! SOMEONE OUT THERE MUST HAVE THE SAME BAD WILL POWER.