Figure 2.

Never smokers: Relative risk* of incident lung cancer and adenocarcinoma of the lung by various factors reported about 3 years after recruitment. Numbers do not always sum to totals due to missing values. N = 833 lung cancers, of which there were 398 adenocarcinoma, 66 carcinoid, 37 small‐cell, 46 squamous‐cell, five large‐cell, 33 other specified types and 248 unspecified/nonspecific histological types. *Adjusted for age, region, deprivation quintile and height. **Question not included on 2% of questionnaires. †Restricted to those who lived with a partner (and therefore at risk of exposure to secondhand smoke through living with a partner who smokes). ‡Reference group are those with neither exposure.