We conducted a large cohort study in a population of workers. The results were the following: The cumulative incidence for COPD (chronic obstructive pulmonary disease) was 13/100,000 among non-smokers and 128/100,000 among smokers. The cumulative incidence of having a heart attack was 1078/100,000 among smokers and 760/100,000 among non-smokers. The prevalence of smoking in this population of workers was 24%. What was the risk difference (RD) for developing COPD, comparing smokers versus non-smokers? Submit the answer per 100,000 people. For example, for an RD of 502 per 100,000, submit 502