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the benefits of quitting smoking far outweigh the reasons to NOT stop smoking, in fact check this list of improvements you should expect to see in your physical/mental health if you quit smoking.
Source: http://www.researchmalignantmesothelioma.com

If You Already Have Lung Cancer

If you already have lung cancer, it is best advised to stop smoking immediately. When you quit smoking, here are the benefits you achieve over time:

After 20 minutes - Your blood pressure will drop and heart rate beats will increase.

After 12 hours - The amount of Carbon Monoxide in your blood system drops to normal level.

After 2 weeks - 3 months - Lung function and circulation of blood from lungs to other organs of the body improves significantly.

After 1 - 9 Months - Shortness of breath & coughing decrease, functions of Cilia (small hair-like substances that get rid of Mucus from the lungs) become normal, your lungs become cleaner, and your risk of catching infections decreases.

After 1 year - Risk of Coronary heart diseases drops by 50%

After 5 years - Risk of Strokes drops to that of a non-smoker who quit smoking 5-15 years ago.

After 10 years - Risk of lung cancer death drops by 50% as well risk of mouth, throat, esophagus, pancreas or Bladder cancer also drops.

After 15 years - Risk of coronary heart diseases becomes that of a non-smoker.