Bronquitis	Bronquitis	Total
	Yes	No
Smoker	651	450	1101
Non-Smoker	367	145	512
Total	1018	595	1613

Based on the following table, calculate the requested measures

1. The risk ratio comparing the exposed and the unexposed study participants

b) The risk difference between the exposed and the unexposed study participants

c) The prevalence of the disease among the entire study sample, assuming the disease is a long-term, chronic disease with no cure and assuming no study participants have died.