Inflammation of the lungs and bronchial tubes are also common causes of shortness of breath, as is injury to the respiratory tract caused by smoking or other toxins. Shortness of breath may occur with injury to the lungs, such as a collapsed lung (pneumothorax).
In the United States, pea soup without qualification usually means a perfectly smooth puree. Split Pea Soup is a slightly thinner soup with visible peas, pieces of ham or other pork, and vegetables (most commonly carrots) and is usually made from dried, green split peas.
Unsoaked peas take from 1 to 2 hours of simmering; soaked peas take about 40 minutes. Also, the only difference between yellow and green split peas is color. 1  Split peas absorb lots of water as they cook, so check the soup often and add liquid as needed.  The peas only need to be cooked until they are tender.