I recently (just before Christmas) quit my 1/2 to 3/4 pack a day cig habit.
I finally just grew tired of them and the blech taste. It was pure convenience that I smoked as long as I did.
The excuse to walk away from a job going horribly wrong to go outside for a cig break kept me sane at work.
Now I take fewer breaks (I'm sure the boss is O.K. with that

)
and when I do I now have a cigar or a bowl.
The biggest plus is I can now TASTE things and I'm enjoying my cigars and pipe a lot more.
The best part is I really don't miss my coughing nails....