Everyone who smokes is at risk for developing Chronic Obstructive Pulmonary Disease, or COPD. The more cigarettes that you smoke over time, the greater the likelihood of developing COPD. Air pollution, second hand smoke, and exposure to other airborne particles such as cooking smoke can also cause COPD. You are correct to be concerned about a family history of COPD. Some people have genetic factors that place them at greater risk of developing COPD. So if family members have COPD, there is a good chance that you are more susceptible to the damage caused by smoke. It is also likely that if your parents smoked, you have had a lot of exposure to "second hand" smoke as a child. Less commonly, there is a genetic abnormality called alpha 1 antitrypsin deficiency that, when present, can cause lung and liver disease even without exposure to toxins. To prevent yourself from developing COPD, or to prevent your existing COPD from getting worse, it is critically important to stop smoking. Chantix is a medication that has shown a lot of efficacy for smoking cessation. Other options include a medication called bupropion (Wellbutrin) and nicotine replacement patches and gum. Of course, "cold turkey" is also a good way to go. The physical addiction to nicotine goes away after only two weeks of withdrawal. You might be grouchy for a couple of weeks, though. After the first two weeks, keeping away from cigarettes usually means finding another activity to do with your hands or your mouth, such as chewing gum or using a fidget spinner. It is also important to get support from family and friends so they can keep you on the right track.
Good luck, you can do it.