I smoked for 14 years. I went to visit my parents in June of 2002 for my father's 70th birthday, my mom was coughing and hacking her way through the weekend. She was 69 at the time, Called it a tickle in her throat or something; her doc was trying to get her to quit smoking but she had been a smoker for 50 years. She looked old, had numerous health problems, used a walker etc, but I just remember her gasping for air.
She had 2 unsuccessful spinal fusions in the mid 90's, I have since learned that the fusion success rate is lower for smokers. Anyhow, I went home from that weekend and vowed I did not want to be like that, I wanted to be healthy. I used the patch, then Wellbutrin. I am still on Wellbutrin and may be on it the rest of my life, I have accepted that.
My mom is still alive, she did finally quit. She is on oxygen 24/7 and has survived bladder cancer (very common among female smokers). She is a good listener when I talk about my spine issues, it runs in her family and its nice to have someone who truly understands (though I am fortunate my friends and loved ones are all sympathetic if nothing else). She is also on Wellbutrin.
If I had not see first hand what smoking does to you after 50 years, seen what it does to someone I love, I may never have quit, its the hardest thing I have ever done. Its the first step in reclaiming your health.
But as others here have said, you have to want to do it, and seeing my mom like that made me want to do it. Find what will make you want to do it. Look into your children's eyes, think of the upcoming fusion surgery you may have, think of what you want to do with your spouse or partner when you retire, and trust me, it likely does not involve an oxygen tank unless you enjoy scuba diving. Find your motivation.