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To study the predictive associations between maternal smoking and the impact of quitting smoking during pregnancy and offspring daily smoking at age 15–16 years.

The Northern Finland Birth Cohort 1986 (NFBC86) includes 99% of all births in the region and has an ongoing follow‐up. Data were collected using questionnaires at 24th gestational week during pregnancy and after delivery, and at follow‐up in 2001–02, when the offspring were aged 15–16 years.

Northern Finland.

NFBC86 included 9432 live born children. Data regarding maternal smoking during pregnancy and offspring smoking at age 15–16 years were available for 4462 subjects (47.3% of the original sample).

The outcome was offspring's self‐reported daily smoking. Maternal smoking during pregnancy was considered using a four‐class variable: (1) no smoking, (2) mother had smoked, but …