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Interviews were conducted with 41 male and 69 female never-smoking lung cancer cases and 117 male and 187 female never-smoking controls . They also calculated 95 % confidence intervals on their estimates , indicating that , given the exposure conditions and baseline health of their study population , the changes in lung function during young adulthood potentially attributable to ETS would be approximately - 1.0 ml / yr per pack-year , which would be of little clinical importance . Results remained unchanged when births in 1982 were excluded from the analysis . Dr. Ladyman : Unfortunately , due to parliamentary business , I will be unable to visit Northamptonshire as intended on 10 January , but I hope to be able reschedule for a later date . Data on mothers ' smoking habits at 2-3 months of pregnancy were available on over 90 % of children born between 1983 to 1987 and for about 50 percent of children born in 1982 . There was no difference in the percent of mothers of children with cancer who smoked 10 or more cigarettes per day ( 37.4 % ) compared to mothers of controls ( 38.0 % ) . The lower figure in 1982 was due mainly to logistical problems during this first year when the birth registry started to collect information on smoking .