Recent studies have shown that people who smoke tobacco cigarettes have a 90% chance of developing COPD. What is COPD you might ask? COPD stands for chronic obstructive pulmonary disease. It is one of the deadly lung diseases that block airflow as you exhale and make it increasingly difficult for you to breathe.
http://www.solarcigarette.com/blog/smokeless-cigarettes/smoking-cigarettes-leading-cause-of-copd/