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Table 1 Factual classification of smoking habits in Wynder and Graham, 1950, [22] and fictional misclassification

From: Can yesterday’s smoking research inform today’s shiftwork research? Epistemological consequences for exposures and doses due to circadian disruption at and off work

Factual Wynder & Graham 1950

Fictional smoking distribution

Individual

Cigarettesa

Classification

Cigarettesa

Mis-classification

 

Cumulative

 

At work

Off work

 

A

<1

Nonsmoker

<1

B

1–9

Light smoker

0

1–9

Nonsmoker

C

10–15

Moderately heavy smoker

5

10

Light smoker

D

16–20

Heavy smoker

0

16–20

Nonsmoker

E

21–34

Excessive smoker

5

16–29

Light smoker

F

≥35

Chain smoker

10

≥25

Moderately heavy smoker

  1. Note that the fictional smoking distribution does not represent any descriptive statistics regarding smoking at or off work in 1950
  2. aper day for more than 20 years