Bob, not to shoot down your spreadsheet or number-crunching, but my wife and I quit this past October so that we can both live longer. It's great to save money (especially with the state that our country is currently in), but we quit so we can live longer and enjoy a better quality of life. We're both 28 years old and we vowed to quit after we came back from our honeymoon -- we never skipped a beat. Quitting was a pain for the first month, but after that is a breeze.
Also, you don't realize just how much you stunk until after you quit smoking
. Granted, we never smoked inside our house, we always went outside (even at others' homes). However, I can always tell if someone around us has been smoking because they smell like a chimney. The smell actually makes me kind of sick when I smell it now.
One more thing to keep in mind -- bass hate tobacco
. It is proven in studies by Dr. Keith A. Jones, PhD (the mastermind behind Berkley Powerbait, Gulp, and GulpAlive baits). He works at the Spirit Lake facility of Pure Fishing (Berkley, Abu Garcia, Spiderwire, Stren, etc.) and does extensive research into what bass like -- and tobacco in any form digusts bass.
Quit to save some change, but also quit so you can enjoy more years in your boat doing what you love to do!