When I became sick 1.5 yr ago (with what turned out to be Lupus) I quit smoking at that time after being addicted for 26 years. Shortness of breath is one of my biggest challenges with Lupus, so I quit to give my lungs a break.
First, you have to plan your quit. Set your quit day and PREPARE for it. Get plenty of distractions (lollie-pops, pencil puzzles, and even take walks around the block).
I used Chantix which helped me ALLOT .. some complain about the side effects. You start taking them 1 week before you quit ..then full doses when you quit up to six months... well, at 20 days I started cutting my pills in half which helped keep the craves at bay - but also cut down on the side effects.
I strongly encourage you to buy and read Allen Carr's book - The Easy Way to Stop Smoking. He smoked over 100 cigs a day for over 30 years and he successfully quit with his methods. Carr teaches that having a cigarette does NOT solve a craving .. rather it CREATES the next craving. Break the cycle.
Get yourself a quit keeper .... google 'quit keeper' and you will find several ... you can download it to your computer and it will track your progress including how much money you have saved and all your milestones ...
Good luck !! If I can do it, anyone can !!!