Although your friend has a family history of heart disease, he smokes, on average, 25 cigarettes per day. He sees the table showing incidence ratios for heart disease (see Exercises 103–106) and feels comfortable that they are less than 2, compared to 9 and 10 for lung cancer. He claims that all family deaths have been from heart disease and decides not to give up smoking. Use the given function and its graph to describe some additional information not given in the table that might influence his decision.

Data from Exercise 103-106

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103. Find P(10). Describe what this means in terms of the incidence ratio, 10, given in the table. Identify your solution as a point on the graph. 104. Find P(9). Round to the nearest percent. Describe what this means in terms of the incidence ratio, 9, given in the table. Identify your solution as a point on the graph. 105. What is the horizontal asymptote of the graph? Describe what this means about the percentage of deaths caused by smoking with increasing incidence ratios. 106. According to the model and its graph, is there a disease for which all deaths are caused by smoking? Explain your answer.