I agree with other posters that you should quit smoking immediately. Not only is smoking going to increase your risk of having the complications mentioned, but it is going to hinder your body's ability to heal quickly and correctly. I would also start walking at least 30 minutes per day now, and drinking tons of water. You want to build up lung capacity, and start getting into shape.
I was already working out 6-8X per week before surgery, and everything was super easy for me. I could have returned to work after 2 days. I smoked for 10 years, and I understand how stress makes you grab for that cigarette. Don't do it though. You are doing this for your health, so why not make a complete change starting tomorrow? You can do this, and will be better off for it.
Good luck to you.