Can someone please check this for me to see if I am on the right track thanks?

Question

Can someone please check this for me to see if I am on the right track thanks?
In a population-based cohort study, an entire community was interviewed regarding smoking habits and then followed for one year. All lung cancer deaths were ascertained and the following data were available: 
•Fifteen (15) lung cancer deaths occurred among 24,500 smokers 
•Two (2) lung cancer deaths occurred among 10,500 non-smokers 
Calculate the following and interpret your results in each case.

1.Calculate the proper measure of association of smoking and lung cancer. 
The relative risk is used to measure the association of smoking and lung cancer.
Using the Rater Ratio to estimate the RR
    = 15/100000 =7.5
          2/100000

Relative Risk=1
 The relative risk is greater than 1 which shows an association between exposure and disease and there is an exposure between smoking and lung cancer.

2.Calculate the population risk difference. 
Risk Difference = AR = I of smoker – I of non- smoker
Smoke   Lung Cancer          Total
                                               Yes        No
 Yes	15	24,500      24,515
 No	2	10,500      10,502

I of smoker
     =15/24515 
     =0.000619
     =6.119/100,000

I of non smoker = 2/10502
                = 0.0001904
                 =1.904/100,000

AR difference =6.1-1.9/100000 =4.2/100000

Among non smokers6.1 /10000 incidence case of lung cancer that occur are attributed to the fact that these people smoke.
Among Smokers 6.1/10000 incidence of Lung Cancer that occur could be prevented if smoking was eliminated.

3. Calculate the population attributable risk for smoking and lung cancer. 
Population attributable risk measures the potential impact of control measures in a population, and is relevant to decisions in public health.
Population attributable risk = attributable risk x prevalence of exposure to risk factor in population

PAR = I of total population – I of 
Smoke  Lung Cancer          Total
       Yes      No
 Yes    15	24,500      24,515
 No      2	10,500      10,502
Total	17	35,000	    35,017

I of total population= 17/ 100000
                     = 0.00017
                      =17/100000
I of non smoker= 2/10502
               = 0.00019044
                =1.904/100000
 PAR = (17-1.94)/100000
     = 15.06
 15.06 of the 17/10000 incidence  of the Lung Cancer are attributed to smoking
 15.06 of the 17/ cases of lung cancer that occur could be prevented from not smoking