[R] Compare the risk

[kiotoqq]

I have a dataset which looks like this:

     cbr  dust smoking expo
1      0  0.20       1    5
2      0  0.25       1    4
3      0  0.25       1    8
4      0  0.25       1    4
5      0  0.25       1    4
6      0  0.25       1    8
7      0  0.25       1    8
8      0  0.25       1    4
9      1  0.25       1    8
10     0  0.29       1    7
11     0  0.29       0    7
12     0  0.29       1    7
13     0  0.30       0   10
14     0  0.30       1   10
15
16
.
.
.


How can I compare the risk of getting bronchitis between smoker and
no-smoker? 




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