Emphysema is a form of chronic (long-term) lung disease. People with emphysema have difficulty breathing from a limitation in blowing air out. There are multiple causes of emphysema, but smoking is by far the most common.Emphysema is one of the main types of chronic obstructive pulmonary disease (COPD).ost commonly, the toxins in cigarette smoke create the damage. The lung changes of emphysema evolve slowly over years: 1  As the fragile tissues between air sacs are destroyed, air pockets in the lungs develop. 2  Air becomes trapped in these spaces of damaged lung tissue.
Tone is an author's style or manner of expression. It gives the   reader clues as to how the author feels about his/her subject.
Finally, look at the details of the story. Language is the first step to finding the tone, but the word choice is just as important. Look how an author describes the setting, a character, or an event. This description will help create the tone. But, they sound so alike: mood and tone do seem very similar, but they are two separate literary elements. Tone is how the author feels towards the subject. We see this by the way the author describes the subject. Mood is how we feel when reading the story. It is our reaction to the atmosphere described by the author.