Last two years ago, my dad was admitted to the hospital due to lung problems that resulted from smoking. His left lung was filled with phlegm. In the x-ray that lung is not already visible. It was really hard for me to see my dad having difficulty of breathing. He once promised not to smoke cigars anymore. He was admitted on Christmas day and he asked the doctor to the out of the hospital before new year. I was so glad that for 5 months we did not smoke but to my dismay, he returned back to smoking.