Table 7 Current cigar smoking and esophageal cancer by inhalation level, cigars per day, and duration

Shanks1998

CPS-I

1 to 2

2.28

(0.74, 5.33)

IRR

Primary

Shanks1998

CPS-I

3 to 4

3.93

(1.43, 8.55)

IRR

Primary

Shanks1998

CPS-I

5+

5.19

(2.23, 10.22)

IRR

Primary

Shanks1998

CPS-I

1 to 2

2.64

(0.03, 14.67)

IRR

Secondary

Shanks1998

CPS-I

3 to 4

1.56

(0.02, 8.68)

IRR

Secondary

Shanks1998

CPS-I

5+

5.63

(1.81, 13.14)

IRR

Secondary

Shapiro2000

CPS-II

1 to 2

1.8

(0.60, 5.00)

HR

Primary

Shapiro2000

CPS-II

3+

1.9

(0.80, 4.90)

HR

Primary

Shanks1998

CPS-I

None

3.4

(1.90, 5.61)

IRR

Primary

Shanks1998

CPS-I

Slight

1.9

(0.02, 10.58)

IRR

Primary

Shanks1998

CPS-I

14.84

(2.98, 43.37)

IRR

Primary

Shanks1998

CPS-I

None

4.15

(1.34, 9.68)

IRR

Secondary

Shanks1998

CPS-I

Slight

2.22

(0.03, 12.37)

IRR

Secondary

Shanks1998

CPS-I

2.69

(0.04, 14.94)

IRR

Secondary

Shapiro2000

CPS-II

1.6

(0.70, 4.10)

HR

Primary

Shapiro2000

CPS-II

Inhalation

1

(0.10, 7.20)

HR

Primary

Shapiro2000

CPS-II

<25

0.9

(0.10, 6.40)

HR

Primary

Shapiro2000

CPS-II

25+

2.2

(1.00, 4.70)

HR

Primary