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.
155 Words To Describe An Authorâs Tone What is tone? Tone refers to an authorâs use of words and writing style to convey his or her attitude towards a topic. Tone is often defined as what the author feels about the subject. What the reader feels is known as the mood. Tip: Donât confuse tone with voice.