Conclusion
COPD makes it hard to breathe, which explains that it is not an ailment to be overlooked. Although one may not know that he is suffering from COPD at the early stages, you should visit your doctor as soon as you notice any symptom and begin to find it hard to breathe. The primary cause of COPD is smoking which is why it is advisable not to smoke.
References:
[1] http://www.healthline.com/
[2] http://www.healthline.com/
[3] http://www.healthline.com/
[4] http://www.healthline.com/
[5] http://www.healthline.com/
[6] http://www.healthline.com/