"I really have no reason for myself to want to live to a ripe old age" Ah, but it is not the shortened life span but the reduced quality of life before death happens... But sheesh you know all that, Janie. The only advice I could give you is the advice that was given me- and which was ultimately successful: Don't try to quit until you are ready; it is so much easier then.

In the meantime ditch the guilt. Enjoy life and celebrate all its aspects.